New API call: get a token based on a recipient_key.

We rolled out a new API call for HTTPush. You can now get a token based on a recipient_key.
Read more about the call here.

We updated
* the online documentation at docs.httpush.com
* the offline documentation at HTTPush Docu v0.10
* the client implementations at HTTPush Ruby Client v4

Also today we crossed an internal milestone with over a hundred signups, which makes us very happy.

Thank you all so far