Upgrades BuddyPress to 1.6.2
BuddyPress file cleanup
Updates WP plugin: Invite Anyone
Fixes PHP 5.4.x notice in BP Group Documents
Avoid PHP 5.4.x warning in BP Docs
Check for existing external feed activity items based on permalink instead of date/content

This should help to prevent instances where changes in the external feed caused
the item to be posted multiple times to the activity feed.

See #743
Adds WP theme: Sliding Door. See #683
Adds plugin management mu-plugin, to blacklist certain plugins from appearing for normal users

See #719
Make sure that groupblog activity text reflects comments vs blog posts. See #730
Ensure that blog privacy levels are respected on Club and Project home pages. See #674
Swap Log In and Sign Up admin bar buttons at 30, to come after BP
Whitespace
Avoid PHP warning
Migrates from Genesis Connect to Genesis Connect for BuddyPress. See #751
Remove BP notification menu from adminbar. See #752
Fixes logic for displaying friend requests in adminbar. See #752
Remove Edit Group and Edit User menus from adminbar. See #752
Downgrades BP to 1.6.1, to ensure WP 3.4.x compatibility. See #753
Adds Gravity Forms. See #418
Updates Custom Profile Filters for BuddyPress to work with BP 1.6+

See #758