NEW: mei/__init__.py to Start MEI Development
WIP-MEI: patch converter.Converter.parseData() to detect MEI vs MusicXML
WIP-MEI: Add Basic Support for Importing <note> Tags

I have a bunch of functions, including tests, that should hopefully serve as a
model for how development will continue. So far, it's only for the <note> tag,
including only these attributes: accid, pname, oct, dur, and dots.
New: Add Support for <note xml:id="">

The xml:id attribute is now carried over into a Note object's "id" attribute.
Formatting: Moved mei/__main__.py Tests into mei/test_main.py

Music21 tests are usually kept in the same file as what they're testing, but
I've separated them here because:
- there will be a *lot* of tests
- it reduces (or "will reduce") the import footprint
- it makes cleaner files (for me)
- we can always put it back later
Fixed: music21.mei.test_main.py Works Again

When I moved the tests (in commit e44cef3) I forgot to make changes to imports.
Now I've fixed the imports.
Refactoring: mei.__main__._articulationFromAttr()

The function previously used a try/except statement as a control structure, so
we could re-raise an exception if relevant. The function now uses an if
statement in a way that avoids raising exceptions we can solve, so it just
propagates.
WIP-MEI: Tests: Add Corresponding Integration Test

mei.test_main.testIntegration2() for mei.test_main.testUnit2()
WIP-MEI: New: Support for <note artic=""> Attribute
Merge branch 'master' into mei
WIP-MEI: New: Add music21.converter.subConverters.ConverterMEI

Required for the music21.converter module to automatically parse MEI files.
WIP-MEI: New: UNTESTED music21.converter.__init__ Imports MEI

Couldn't figure out proper testing yet, but it appears to work...
WIP-MEI: Fixed: Add "mei" Module to music21.__init__
WIP-MEI: New: Add <rest> Importing and Tests
WIP-MEI: Fixed: Minor Update to noteFromElement() Docs

Just to bring the "status" message up to date with reality.
WIP-MEI: Fixed: Descriptions of <note> Tests Reflect Their Purpose
WIP-MEI: New: Preliminary Implementation of mei.__main__.convertFromString()

This function will require extensive work as more elements are implemented, but
this works for now.
WIP-MEI: New: Add Importing for <chord> Tag

Only the basic elements so far
Merge branch 'master' into mei
Merge remote-tracking branch 'upstream/master' into mei