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?"
custom 404 with Mr.G image.
added warning message to admin deletes a user
corrected titles
Merge pull request #37 from LaunchAcademy/warning_before_delete

added warning message to admin deletes a user
Fix partial renderer when review fails.
Move datetime formatting to helper.

Eliminates duplication in the models.
Remove redundant check for nil.
Add quiet assets gem.

Makes it easier to read development logs.
Merge pull request #40 from LaunchAcademy/quiet_assets

Add quiet assets gem.
Merge pull request #36 from LaunchAcademy/custom-404

Custom 404 with Mr.G image.
merged in master
merged in adam's changes
Merge pull request #38 from LaunchAcademy/optimize

Optimize
fixed controller so query is in the database
merged with origin master