Microfs

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* Allow external modules to use built-in device detection and connection.

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* Unlink command logic from device detection and serial connection.

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* Fix broken 'put' and 'get' commands to work with arbitrary file sizes.
* Fix error when working with binary data.
* Update execute function to work with lists of multiple commands.
* Minor refactor to extract raw mode related code.
* Updated tests to keep coverage at 100% on both Python 2 and Python 3.

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* Remove spare print call.

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* Fix broken setup.

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* Full implementation of all the expected features.
* 100% test coverage.
* Comprehensive documentation.