Updating fineprint URL for feedback
fix bug 797110 - Allow saves in source mode
Merge pull request #832 from lmorchard/823721-add-gettext-to-vagrant

bug 823721: Add gettext to ubuntu vagrant VM
Merge pull request #836 from darkwing/source-save-797110

fix bug 797110 - Allow saves in source mode
Removing entire top block of the homepage.
Merge pull request #834 from darkwing/learn-feedback-url

Updating fineprint URL for feedback
fix bug 799633 - Remove duplicate signin button
Merge pull request #833 from darkwing/hide-close

Removing homepage 'close' link
Merge pull request #835 from darkwing/dupe-signin-799633

fix bug 799633 - Remove duplicate signin button
fix bug 834296, 834297: Alternate Bleach whitelist switch

* New Constance settings to allow runtime changes to alternate Bleach
  whitelists

* ?bleach_new query parameter for authenticated users that switches
  document view over to the Constance-defined Bleach whitelists

* Flag in DocumentManager.clean_content() to use Bleach whitelists
  defined in Constance settings

* Tweaks to kumascript.post() processing chain to use the
  alternate whitelist flag

* Tests