Add basic tags thing.
Removed code from other PR and fixed pylint.
Merge branch 'add_tags' of https://github.com/Cal-CS-61A-Staff/ok into add_tags

* 'add_tags' of https://github.com/Cal-CS-61A-Staff/ok:
  Removed code from other PR and fixed pylint.
  Add basic tags thing.
Re-added tags property to models.
Fixes docstring
Merge branch 'add_tags' of https://github.com/Cal-CS-61A-Staff/ok into add_tags

* 'add_tags' of https://github.com/Cal-CS-61A-Staff/ok:
  Fixes docstring
  Re-added tags property to models.
Make tags pretty
actually autocomplete and tag name change
Merged master.
Fixed bad merge
Merge remote-tracking branch 'origin/master' into add_tags
Merge pull request #251 from Cal-CS-61A-Staff/add_tags

Add tags