Ability to "Create X" from wide sidebar buttons
Summary: Shorten home to 240, 3 items wide, add create button for certain wide apps.
Test Plan: Test in FF, Chrome, IE8/9
Reviewers: epriestley, btrahan, codeblock
Reviewed By: epriestley
CC: aran, Korvin, vrana
Differential Revision: https://secure.phabricator.com/D4555