Sync with WordPress.com master.

* Fix bug where emails would be sent during autosaves in WordPress 3.9
* Trim email addresses
* Add action for bbPress posts. This won't be triggered on WordPress.org installs, but it's harmless and merging it will make maintaining the .com and .org versions of this plugin simpler.


git-svn-id: https://plugins.svn.wordpress.org/email-post-changes/trunk@932125 b8457f37-d9ea-0310-8a92-e5e31aec5664