Translate

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* Add LibreTranslate

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* Add sphinx documentation
* Update readme.

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* Makefile: Add a make release command
* Add twine to dev requirements.

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* Refactor: Create a folder to add all providers instead to let in a single file
* Add Microsoft provider
* Add more documentation to all providers (Translated-MyMemory and Microsoft Translator)
* Add arguments to change the default provider using translate-cli

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* Refactor translate-cli (command line interface) Using Click library instead of ArgParser
* Unify translate-cli and main to avoid duplicate code
* Add documentation to be used on helper commands on translate-cli
* Remove unnecessary code
* Refactor setup to complete information in the PKG-INFO used by PyPI

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* Change the license from "BEER-WARE" to MIT