Subler

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* Fixed an issue with improperly escaping metadata for use with `subprocess.check_output`
* Added improved DEBUG logging for generated commands and their results
* Improved the default `Subler.dest` attibute to create a unique destination filename
* Added a collection of automated tests for Travis CI
* Added Travis CI support

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* Added subler.tools module
* Added subler.cli module which provides the interactive pysubler commandline tool
* Added subler.subler.Subler.existing_metadata_collection property
* Fixed bug with default Subler dest attribute

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* Bug fix to keep RTD happy

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* Addition of subler.utils module for utility functions
* More intuitive SublerCLI executable path discovery
* Added better shell escaping for SublerCLI arguments
* Fixed SublerCLI version property
* Fixed tracks property for outputting the track listings of the source file
* Subler existing_metadata property is now returned as a list of Atoms

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* Initial release