fixed TODO in meter.py -- thanks to Timothy Aveni.

git-svn-id: http://music21.googlecode.com/svn/trunk@3361 5c16147e-a200-11de-b0cc-ab0ad15e60d0
make Roman tests pass for now, but add TODOs to fix.

git-svn-id: http://music21.googlecode.com/svn/trunk@3362 5c16147e-a200-11de-b0cc-ab0ad15e60d0