Revert to 1.9.3 version -- will do 2.0 as a separate branch.
added chordify test
Merge branch 'version2'

Conflicts:
	music21/base.py
	music21/corpus/metadataCache/core.json
	music21/duration.py
	music21/note.py
	music21/sites.py
	music21/stream/__init__.py
metadataCache/cor.json fix
ignore .orig files.
Merge branch 'master' into version2