So changes. Much wow.

This release introduces a number of breaking changes.

• All models are now namespaced under the Model module. This was mostly to clean up the documentation and not pollute the Telegram::Bot namespace.
• I have started working on support for the Telegram user API. Because of that there are now two requirable files paths: tourmaline/bot and tourmaline/user. The latter doesn't provide anything but the lib definition and will require TDLib to be installed and available.

I added a couple methods that I missed as well.