Rename feature files for consistency

Use noun-verb combination in present tense.
Add ClearanceBackDoor for faster integration tests
Write feature spec for admin creating categories

Use "Experience" objects, which are the same things as Page objects:

http://code.google.com/p/selenium/wiki/PageObjects
Use normalize-rails for admin style

Temporary solution to move past default browser style sheet.
Add missing test coverage on User#account
Reduce routing interface

Add admin categories routes.
Display accounts on admin dashboard
Display categories alphabetically
Find category links in admin feature spec
Extract /account_admin