Add support for Push notifications to the application

[andrewhowdencom]

This would begin suuuper generically; just some sort of generic system that pushes something simple (maybe order status changes?) to the relevant recipients. Inchoo has already done some work here:

http://inchoo.net/magento/push-notifications-magento/

/cc @toh82, @PatrickKubica

Creating this issue just to signal intent, so that anyone who stumbles upon this and has perhaps done something similar can find it and drop us some links. <3

This will likely follow the manifest issue #10 in priority queue.