Jetpack: Roll in all the changes from the GitHub Repository for 2.8-beta1
For individual history, see: https://github.com/Automattic/jetpack/tree/c18c6d692f8881506e5bc904cdc024f9d4d16151
Pulling from the 2.8 branch: https://github.com/Automattic/jetpack/tree/2.8


git-svn-id: https://plugins.svn.wordpress.org/jetpack/trunk@843950 b8457f37-d9ea-0310-8a92-e5e31aec5664