Bug 835506: Add /b/ passthrough for facebook download tab.
Bug 835506: Fix Download Tab share image URL

Adjust to production server's CDN media URL. Facebook dialogs always need absolute URLs so to make it work in all environments, whatever the media URL is missing must be prepended.
Bug 835506: Fix Download Tab analytics tracking

Wasn't correctly tracking the custom URL.
Add required minimum jQuery version and load in a non-conflicting manner if jQuery exists but is older than the required version.
Bug 859289 - Fix background of firefox/new/ in IE6
Merge pull request #834 from glogiotatidis/ambassadors

[bug 859564] Add student ambassadors form.
Merge pull request #837 from sgarrity/retornam-Bug859289-improvebackground

Bug 859289 - Fix background of firefox/new/ in IE6
Switch back to using $ for local jQuery alias and define a jQuery local var as well. This will prevent accidentally using the wrong version of jQuery when someone uses $ in tabzilla in the future."
Clean up conditional.
Merge remote-tracking branch 'gauthierm/bug-869530-tabzilla-old-jquery'
Merge pull request #839 from Nobox/download-tab-bugs

Bug 835506: Fix Download tab bugs