text: Title: problem install with PostgreSQL database
  Body: Hello
  
  I'm trying using PostgreSQL database to make your example work. I have problem with logs error like this
  
  > Traceback (most recent call last):
    File "/home/me/.virtualenvs/flask-noota-api/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1182, in _execute_context
      context)
    File "/home/me/.virtualenvs/flask-noota-api/lib/python3.5/site-packages/sqlalchemy/engine/default.py", line 470, in do_execute
      cursor.execute(statement, parameters)
  psycopg2.ProgrammingError: column "password" cannot be cast automatically to type bytea
  HINT:  You might need to specify "USING password::bytea".
  
  
  >The above exception was the direct cause of the following exception:
  
  > Traceback (most recent call last):
    File "/home/me/.virtualenvs/flask-noota-api/bin/invoke", line 11, in <module>
      sys.exit(program.run())
    File "/home/me/.virtualenvs/flask-noota-api/lib/python3.5/site-packages/invoke/program.py", line 293, in run
      self.execute()
    File "/home/me/.virtualenvs/flask-noota-api/lib/python3.5/site-packages/invoke/program.py", line 408, in execute
      executor.execute(*self.tasks)
    File "/home/me/.virtualenvs/flask-noota-api/lib/python3.5/site-packages/invoke/executor.py", line 114, in execute
      result = call.task(*args, **call.kwargs)
    File "/home/me/.virtualenvs/flask-noota-api/lib/python3.5/site-packages/invoke/tasks.py", line 114, in __call__
      result = self.body(*args, **kwargs)
    File "/home/me/CODER/python/flask-noota-api/tasks/app/_utils.py", line 61, in wrapper
      return func(*args, **kwargs)
    File "/home/me/CODER/python/flask-noota-api/tasks/app/db.py", line 277, in init_development_data
      context.invoke_execute(context, 'app.db.upgrade')
    File "/home/me/CODER/python/flask-noota-api/tasks/__init__.py", line 73, in invoke_execute
      results = Executor(namespace, config=context.config).execute((command_name, kwargs))
    File "/home/me/.virtualenvs/flask-noota-api/lib/python3.5/site-packages/invoke/executor.py", line 114, in execute
      result = call.task(*args, **call.kwargs)
    File "/home/me/.virtualenvs/flask-noota-api/lib/python3.5/site-packages/invoke/tasks.py", line 114, in __call__
      result = self.body(*args, **kwargs)
    File "/home/me/CODER/python/flask-noota-api/tasks/app/_utils.py", line 61, in wrapper
      return func(*args, **kwargs)
    File "/home/me/CODER/python/flask-noota-api/tasks/app/db.py", line 163, in upgrade
      command.upgrade(config, revision, sql=sql, tag=tag)
    File "/home/me/.virtualenvs/flask-noota-api/lib/python3.5/site-packages/alembic/command.py", line 174, in upgrade
      script.run_env()
    File "/home/me/.virtualenvs/flask-noota-api/lib/python3.5/site-packages/alembic/script/base.py", line 416, in run_env
      util.load_python_file(self.dir, 'env.py')
    File "/home/me/.virtualenvs/flask-noota-api/lib/python3.5/site-packages/alembic/util/pyfiles.py", line 93, in load_python_file
      module = load_module_py(module_id, path)
    File "/home/me/.virtualenvs/flask-noota-api/lib/python3.5/site-packages/alembic/util/compat.py", line 68, in load_module_py
      module_id, path).load_module(module_id)
    File "<frozen importlib._bootstrap_external>", line 388, in _check_name_wrapper
    File "<frozen importlib._bootstrap_external>", line 809, in load_module
    File "<frozen importlib._bootstrap_external>", line 668, in load_module
    File "<frozen importlib._bootstrap>", line 268, in _load_module_shim
    File "<frozen importlib._bootstrap>", line 693, in _load
    File "<frozen importlib._bootstrap>", line 673, in _load_unlocked
    File "<frozen importlib._bootstrap_external>", line 665, in exec_module
    File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed
    File "migrations/env.py", line 93, in <module>
      run_migrations_online()
    File "migrations/env.py", line 86, in run_migrations_online
      context.run_migrations()
    File "<string>", line 8, in run_migrations
    File "/home/me/.virtualenvs/flask-noota-api/lib/python3.5/site-packages/alembic/runtime/environment.py", line 807, in run_migrations
      self.get_context().run_migrations(**kw)
    File "/home/me/.virtualenvs/flask-noota-api/lib/python3.5/site-packages/alembic/runtime/migration.py", line 321, in run_migrations
      step.migration_fn(**kw)
    File "/home/me/CODER/python/flask-noota-api/migrations/versions/36954739c63_.py", line 28, in upgrade
      existing_nullable=False)
    File "/usr/lib/python3.5/contextlib.py", line 66, in __exit__
      next(self.gen)
    File "/home/me/.virtualenvs/flask-noota-api/lib/python3.5/site-packages/alembic/operations/base.py", line 299, in batch_alter_table
      impl.flush()
    File "/home/me/.virtualenvs/flask-noota-api/lib/python3.5/site-packages/alembic/operations/batch.py", line 57, in flush
      fn(*arg, **kw)
    File "/home/me/.virtualenvs/flask-noota-api/lib/python3.5/site-packages/alembic/ddl/postgresql.py", line 91, in alter_column
      existing_nullable=existing_nullable,
    File "/home/me/.virtualenvs/flask-noota-api/lib/python3.5/site-packages/alembic/ddl/impl.py", line 118, in _exec
      return conn.execute(construct, *multiparams, **params)
    File "/home/me/.virtualenvs/flask-noota-api/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 945, in execute
      return meth(self, multiparams, params)
    File "/home/me/.virtualenvs/flask-noota-api/lib/python3.5/site-packages/sqlalchemy/sql/ddl.py", line 68, in _execute_on_connection
      return connection._execute_ddl(self, multiparams, params)
    File "/home/me/.virtualenvs/flask-noota-api/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1002, in _execute_ddl
      compiled
    File "/home/me/.virtualenvs/flask-noota-api/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1189, in _execute_context
      context)
    File "/home/me/.virtualenvs/flask-noota-api/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1393, in _handle_dbapi_exception
      exc_info
    File "/home/me/.virtualenvs/flask-noota-api/lib/python3.5/site-packages/sqlalchemy/util/compat.py", line 203, in raise_from_cause
      reraise(type(exception), exception, tb=exc_tb, cause=cause)
    File "/home/me/.virtualenvs/flask-noota-api/lib/python3.5/site-packages/sqlalchemy/util/compat.py", line 186, in reraise
      raise value.with_traceback(tb)
    File "/home/me/.virtualenvs/flask-noota-api/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1182, in _execute_context
      context)
    File "/home/me/.virtualenvs/flask-noota-api/lib/python3.5/site-packages/sqlalchemy/engine/default.py", line 470, in do_execute
      cursor.execute(statement, parameters)
  sqlalchemy.exc.ProgrammingError: (psycopg2.ProgrammingError) column "password" cannot be cast automatically to type bytea
  HINT:  You might need to specify "USING password::bytea".
   [SQL: 'ALTER TABLE "user" ALTER COLUMN password TYPE BYTEA ']
  
  -------------------
  tested with
  - Python 3.5.2
  - (PostgreSQL) 9.4.10
  
  installed dependencies
  > alembic==0.8.10
  aniso8601==1.2.0
  apispec==0.19.0
  appdirs==1.4.2
  arrow==0.8.0
  bcrypt==3.1.3
  cffi==1.9.1
  click==6.7
  colorlog==2.10.0
  Flask==0.12
  Flask-Cors==3.0.2
  Flask-Login==0.4.0
  flask-marshmallow==0.7.0
  Flask-OAuthlib==0.9.3
  flask-restplus==0.10.1
  Flask-SQLAlchemy==2.2
  invoke==0.15.0
  itsdangerous==0.24
  Jinja2==2.9.5
  jsonschema==2.6.0
  lockfile==0.12.2
  Mako==1.0.6
  MarkupSafe==0.23
  marshmallow==2.13.1
  marshmallow-sqlalchemy==0.12.0
  oauthlib==2.0.1
  packaging==16.8
  passlib==1.7.1
  permission==0.4.1
  psycopg2==2.7
  pycparser==2.17
  pyparsing==2.1.10
  python-dateutil==2.6.0
  python-editor==1.0.3
  pytz==2016.10
  PyYAML==3.12
  requests==2.13.0
  requests-oauthlib==0.8.0
  six==1.10.0
  SQLAlchemy==1.1.5
  SQLAlchemy-Utils==0.32.12
  webargs==1.5.3
  Werkzeug==0.11.15
  
  any idea ?
  