Tgbotplug

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* Modified webserver to support multiple bots (as polling already did), you can now call tgbot.webserver.run_server() with an array of bots instead of a single bot instance
* Removed TGBot.\_token because token was already stored in TGBot.token

Impact:
* In the rare cases where you would access TGBot().\_token, replace with TGBot().token

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* Add username to User model
* Added NOT NULL to User.last_name as it is optional after all

Impact:
* For existing databases, please execute `python -m tgbot -d EXISTING_DATABASE_URL --migrate-db` to update the User table

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* Imported twx.botapi code (leaving proper credits and references) to make it easier to maintain
* Added support for inline_query plugins

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* Quicky and dirty upgrade to twx.botapi 2.0.1 to include inline stuff and file downloading. Even though it was a major upgrade to twx.botapi (they changed a few classes), I'm keeping it as a minor upgrade as there was no database impact for tgbotplug. In the future there should be a v2.0 that will have the database revisited

Impact:
* Review the code where you access twx.botapi.GroupChat directly (in case you do). There's a new parameter to distinguish chat types (Chat.type) instead of using isinstance()

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* Renamed tgbot.models to tgbot.database: database_proxy was a global variable and it wouldn't allow a single process to declare more than one bot with different databases - fixed by using a model_factory
* As models are now available only to TGBot instances, TGPluginBase now contains a `bot` property that is set by the bot instance itself (when it is initialized). The only downside is that one instance of a plugin can attached to a single instance of a bot, but the upside is that all plugin methods were simplified without the need of moving bot parameter around.

Impact:
* Review all the places where you access models, as now they are only available through the bot instance (not the module)
* Remove bot parameter from your plugin methods and use self.bot instead

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* Untracked / initial release