Remove bad tests
Add ImageLinkValidator
Add tests for ImageLinkValidator
Make ClubImagePowerup use the new ImageLinkValidator
Correct message for success.
Add ImageLinkValidator to FeedPowerup
Add status code 412 to list of possible results
Fix ClubImagePowerup's rendering issues.
Add missing modernizr
Don't invalidate on errors.
Merge branch 'feature/linkvalidation' into develop
Merge remote-tracking branch 'origin/develop' into develop
Add file type error to ImageLinkValidator
Conflicts:
	app/powerups/core/feedpowerup/FeedPowerup.java