US#90 Github webhooks integration
Adding API support for project modules configurations
Renaming function get_config_or_default to get_or_generate_config
Making commit message actions case insensitive
Fixing bug when changing us's to a non existing status
Adding name validation to task status serializer and issue status serializer
Using 400 errors insted of 401
Fixing slug generation for issue status, task status and user story status
Adding regular expresion to convert github references to links to github
Removed the admin pk in the initial_user.json fixture
Fixed travis errors
Fixed problem with github references link
Fixed test on Github link
Minor fixes
Fix some tests
Merge pull request #149 from taigaio/us/90/github-integration

US#90 Github webhooks integration