Ability to pause subscription

[tnerbovik]

It would be great to be able to pause subscriptions. Nice option when canceling isn't.

[Tam]

pause.mov

I recently added support for this to one of our clients sites. I've extracted the code into it's own module (untested): https://gist.github.com/Tam/31aaa14b7ff274940efe40f701774c54