* Added a Javascript autocomplete for searching Projects
* Updated the Users and Groups controllers' #edit_membership method to
  create/update multiple Member records

I can't find any real reason they are needed at all and were taking
a lot of time to run. Results for the test class

Before: 56 seconds
After: 23 seconds

The #main-menu was used as the entire left column but was having styles
applied to it for the menu which were leaking onto the #sidebar. By
wrapping the column in a unique div the menu styles were isolated from
the sidebar styles.

Based on r6226 from Redmine by Jean-Philippe Lang