add controller, view, routes
Added route, controller for Challenges
fix typo
Added routes, controller and views for attempts with test.
added attributes line in challenges view
add attributes to rabl
Attempts test updated.
added request test for Challenges
add Users API task test
Merge pull request #9 from lion-of-conquest/attempt_request

Attempt request
edit Users API task test
Merge branch 'uuid'
merged uuids.
merged 'challenge'.
Merge branch 'challenge'
updated routes.
Merge branch 'task'
requst.
Merge branch 'master' into attempt_request
Merge branch 'attempt_request'