Feature request: the ability to restore all services at once.

[Calrion]

First of all thanks for this, it's been really handy.

I expect my tests to be independent from each other, and also to not need to cleanup after themselves. Given this, I'd like to call a single AWS.restore() (or similar) after each test runs.

Would you be interested in a PR with such a function?

Any suggestions on how you'd like to see it work? I was thinking a list of services could be maintained when stubbing, then it'd be easy enough to iterate through these calling .restore(), but I'm happy to defer to your judgment.