Commit changes from #214

This is the implementation of the applications page
by @adam-at-mobomo initially proposed in #214.  It implements
story #111.
Revert incorrect merge changes

These changes were merge conflicts and were resolved incorrectly.
Resolving these merge conflicts from feature/manage-approved-apps
to bring back correct formatting on authorizations page and
header.
Redirect "Revoke Application" to Applications page
Merge pull request #249 from 18F/feature/manage-approved-apps-clean

Manage Approved Apps