Add debug information and :users resource
Add support for Gravatar
Add signup form
Add basic reaction to input invalid user data on signup
Add _error_messages partial and basic info about errors on signup
Add redirect to user page after successful signup + test for invalid signup
Add test for valid submission
Use SSL and Unicorn in production
Merge branch 'sign-up' into develop

Finish work on signup process
Add Gravatar size change, tests for flash text and divs existence in _error_messages, and content_tag