Manual Rocketeer

Instead of requiring the installation of a third-party plugin, it might be easier to just integrate the Manual control filter directly into Rocketeer. It's probably easier for everyone than to have to install another plugin.

Manual Control and this pull request use Jetpack's ```jetpack_get_default_modules``` filter. You can read more about it [here](http://jetpack.me/2013/10/07/do-not-automatically-activate-a-jetpack-module/).