Add organisation hash when registering

Registering now requires an organisation hash to be present - you should include name and type in the hash.

Publish as draft and register with price plan

You can now publish petitions in a draft state, as well as register for an account with a price plan rather than a promo code.

put_with_auth and get_with_auth now support data arguments

Now you can use put_with_auth and get_with_auth with optional data arguments. Also the API will throw an exception if you try to build one with missing parameters.

Authentication for updating feeds

Updating feeds now requires auth