music21 v. 3 release (3.1.0)

v.3.0.6-beta

v. 3.0.3-alpha release

fix matplotlib 1.5 in m21_2 also

v 2.1.2

v 2.1 (out of beta)

Release v2.0.11

v. 2.0.10 -- musicxml + durationtuples

fix quodJactatur errors

documentation rebuilt