created base controller for other api controllers to inherit from
initial implementation of sessions controller
Created controller for handling registrations
Include devise test helpers for testing
Created registration controller tests
added tests for sessions controller

-ensure one can login by email or username
-verify invalid login attempts do not succeed
status code for #create should be :ok not :okay
check if the status code is 401 for failed login attempts
created bookmarks controller with tests
Created sessions table
Fix bug where user was not redirect to correct sub state
Added trait to create bookmarks when creating a user
Override json representation method for customization
fixed bug in find_first_by_auth_conditions method
added newline under api routes for readability
minor cleanup
use rack-cors for cross-origin ajax support
Client now retrieves popular bookmarks from the api server
New controller added for handling user bookmarks
Updated for new javascript files (user and popular controllers)