Rpi-backlight

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- Fixed bug in ``get_power``, which would eventually always return False
- Added parameters and return types in docstrings

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- Added ``duration`` parameter to ``set_brightness``
- ``smooth`` now defaults to ``False``
- Huge improvements on CLI
- Fixed renamed function in examples
- Minor code and readme improvements

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- PR 3 by Scouttp: Fixed permission errors
- Added documentation
- Code improvements
- Fixed typos

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- Check for ``pygobject`` being installed
- Code cleanup
- README improvements

- Added external links
- Added badges
- Fixed typos

- Moved to Travis CI and Landscape.io for builds and code health testing
- Prepared docs hosting at readthedocs.org

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- Fixed type conversion

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- Added experimental GUI (start with ``rpi-backlight-gui``)