First release

[Datseris]

The following should happen for this to be released as a proper julia package:

• Add proper tests to the test folder.
• Test on Travis (using Mac). Does it work on linux as well?
• Test on AppVeyor
• Use Attobot to easily tag releases
• Integrate Mplay in the documentation page of JuliaMusic
• Add runnable examples using accessible midi files from MIDI.jl.
• Tag version 0.1.0

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I am not sure what tests should go into the tests folder though.