Add a filter that allows site admins/owners to enable Photon for HTTPS URLs.

Fixes #1653

Props @willnorris


git-svn-id: http://plugins.svn.wordpress.org/jetpack/trunk@757167 b8457f37-d9ea-0310-8a92-e5e31aec5664
Update the gallery settings JS so that column settings are shown for default gallery types. Fixes #1801. Props @jeherve.



git-svn-id: http://plugins.svn.wordpress.org/jetpack/trunk@757178 b8457f37-d9ea-0310-8a92-e5e31aec5664
Widgets: Twitter Timeline: Update the height/width using correct params. Add the "tweet-limit" param.

Fixes #1775



git-svn-id: http://plugins.svn.wordpress.org/jetpack/trunk@757222 b8457f37-d9ea-0310-8a92-e5e31aec5664