Adding dynamics transform to support issues #42
Better docstring on dynamics transform.
Merge branch 'master' of https://github.com/jtauber/sebastian

Conflicts:
	tests/test_transforms.py
Fixing tests for dynamics transforms. Fixing midi_to_pitch transform to ignore points that don't have MIDI_PITCH set. Adding dynamics to lilypond output.
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Merge pull request #47 from smcq/master

Adding linear dynamics transformation