last of the 2/3 fixes
Add subseq operator / transform for oseq. For #40
Add subseq for hseq instances. Fixes #40
Merge pull request #43 from aisipos/subseq

Implement subseq (formerly called extract) for HSeq and OSeq
transform for going from midi to internal pitch
Make Lilypond form work for points without a pitch - defaulting to \xNote c in this case. Closes #34
Merge pull request #44 from aisipos/lilypond_duration

Make Lilypond xform work for points without a pitch
Fix xNote rendering of non-pitch points to produce a middle-c
Merge pull request #45 from aisipos/lilypond_duration

Fix xNote rendering of non-pitch points to produce a middle-c in lilypond
handle dotted notes in lilypond rendering
protect against zero durations
Make transpose operate on pitches, not midi_pitches. Fixes #30 .
The invert transform will be fixed in later work.
Merge pull request #46 from aisipos/transforms

Make transpose operate on pitches, not midi_pitches. Fixes #30 .
Merge branch 'master' of https://github.com/jtauber/sebastian

Conflicts:
	tests/test_transforms.py