Add "includes" in categories, cats controllers

Edit index/show views correspondingly
Edit category show page to mimic cat index page
Switch order on admin user index page
refactored cats show page
Additional refactoring of show page

Also changed "is admin?" to "admin?"
Top cats added to index page and cats controller.

Minor styling added to user profile page. Removed review change methods from users controller as it is now handled by devise.
pagination test now passing
Votes changed to paws, used pluralize
Fix partial renderer when review fails.
Move datetime formatting to helper.

Eliminates duplication in the models.
Remove redundant check for nil.
merged in master
merged in adam's changes
user email removed from profile page, edit profil link removed for all but user
Merge pull request #38 from LaunchAcademy/optimize

Optimize
removed logic for empty string
added test for clearing tags
fixed controller so query is in the database
merged with origin master
merged with top cats changes
Merge pull request #35 from LaunchAcademy/aw-top-cats

Top cats added to index page and cats controller.