adds uniqueness to enrollment
Merge branch 'master' into enrollments

Conflicts:
	db/schema.rb
Start writing security tests & added identifiers
The \S+_security.feature files are most important
Added page identifiers and improved tests
Merge with master
Wrote test for enrollment duplication and added reenrollment function
Added check for user in enrollment spec
Merge pull request #99 from boersmamarcel/enrollments

adds uniqueness to enrollment
Cleaned up ChallengesController
Update README.md

Coverage!
Added Coveralls
Merge branch 'master' of https://github.com/boersmamarcel/challengesplatform
Adds feature and message model

Not working just yet.
Removed brakeman
Started allowing access to the Devise controllers
Updated travis.ytml
Fix for travis
Devise whitelisting for before_filters
The controller added in last commit is now actually used
travis fixje
Fix for user