initial iPython support in music21

git-svn-id: http://music21.googlecode.com/svn/trunk@3372 5c16147e-a200-11de-b0cc-ab0ad15e60d0
fixed iPython test to only get notebook

git-svn-id: http://music21.googlecode.com/svn/trunk@3373 5c16147e-a200-11de-b0cc-ab0ad15e60d0