Refactor the authenticator

[jarias]

Currently the code around authenticators https://github.com/stormpath/stormpath-sdk-spec/blob/master/specifications/authenticators.md

Is kind of messing and has a lot of code duplication and is hard to follow it. As an example just to add the org name key to the password and stormpath_token grant types I modified 14 files, to put the functionality in perspective the idea was to add new param to the request.