refactored events controller and fixed events views
moved create_challenge link from index
Red to Green
Merge branch 'styling' into development
New styles for challenge index
Nav Bar Made gray
Added local ip to greenlist for better_errors (localhost works, tie-fighter.local didn't)
Removed visibility of each loop on challneges#index.  Added time.ago to index
Only show updated at if it differs from created at in challnges#index & challenges#show
Merge branch 'development' into spec
Added forms test for challenges