text: Title: Code quality metrics: add codify / landscape to project
  Body: Hello,
  
  it will be nice to enable Landscape https://landscape.io/
  It can help to track many bugs (even before you noticed them)
  
  For example 
  this https://github.com/manahl/arctic/issues/49 
  https://github.com/manahl/arctic/blob/master/arctic/tickstore/tickstore.py#L106
  should be found easily by Landscape
  
  Codacy https://www.codacy.com/ might also be something to consider
  
  Coveralls provide code coverage https://coveralls.io/
  and is also something that should be considered
  
  Landscape and Codacy are very easy to use as they are services.
  Coveralls is a little bit harder to setup... but nothing impossible.
  
  It can be also interesting to test code quality locally...
  
  so it may be worth to also set tox https://testrun.org/tox/latest/
  flake8 https://flake8.readthedocs.org/ ...
  (other tools are pylint http://www.pylint.org/ pychecker http://pychecker.sourceforge.net/
  pyflaskes https://launchpad.net/pyflakes/
  flake8 https://flake8.readthedocs.org/
  pep8 http://pep8.readthedocs.org/
  mccabe http://www.mccabe.com/
  ) but flake8 is a wrapper around PyFlakes, pep8, Ned Batchelder’s McCabe script
  so it may be enough
  
  You can find interesting project templates with these tools enabled 
  https://github.com/audreyr/cookiecutter-pypackage
  
  We use Travis, Landscape, Coveralls in 
  https://github.com/pydata/pandas-datareader
  
  So a first step could be to enable Landscape as it's easy and can help a lot.
  
  Kind regards
  