Pyshorteners

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* Major release, see docs for complete overview

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Breaking changes on the shorteners classes

* Removing the `Shortener` class on the Shortener classes. Check the README for the new examples
* Adding wp-a.co Shortener 40

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* Fix goog.gl shortener

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* Add timeout kwarg 9

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* add `debug` kwarg on Shortener class
* implemented `total_clicks` method on BaseShortener class.
* implemented `total_clicks` on BitlyShortener
* change BitlyShortener `short` and `expand` to use GET requests
* BitlyShortener only requires `bitly_token` for shortening/expading/analytics
* 100% Coverage :smiley:

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* Fix import shortcut
* add `_get` and `_post` helper methods on BaseShortener