Run flake8 as part of the travis before_script stage
Add flake8 config file -- ignores tests/ docs/ and migrations/
Update code to be flake8 compliant
Uncomment HTMLExporter import but exclude from flake8 as it's unused
Add missing 'not' in if statement when creating DataConcepts in init
Fix missing reference to avocado.events.models.Log in events test
Wrap function arguments when possible

old habits die hard...
Merge pull request #149 from cbmi/flake8

Update the codebase to be flake8 compliant