pwiz not output models.py  with Mysql BLOB
The mapping in the `playhouse.reflection` module explicitly associates MySQL BLOB columns with `TextField`s. I wish I had left a comment as to why it is that way... There seems to be some odd behavior with the way MySQL / Python handle BLOBs compared to the other database engines Peewee supports out-of-the-box (the blob field test cases are skipped for MySQL). I've made a couple changes and will let the continuous integration run the tests and see what shakes out from there.
 If you take a look here, it seems to be a limitation of the Python MySQL drivers:

https://github.com/django/django/blob/master/django/db/backends/mysql/introspection.py#L15-L37

Note how all the `BLOB` types get mapped to `TextField` -- this is also the behavior of pymysql:

https://github.com/PyMySQL/PyMySQL/blob/master/pymysql/constants/FIELD_TYPE.py

So rather than assuming BlobField everywhere, peewee does what Django does and assumes TextField. You can go back through the code and make replacements where needed, of course.

pwiz not output models.py  with Mysql BLOB? 

parse error, My mysql filed is blob,  pwiz output TEXTFIELD .

Thanks U. 
