Merge pull request #1 from jjgomez/master

Implemented a dynamics object similar to one found in music21 python.
change .gitignore
requireTests

and remove accentually included ext file
src improvements
mv pitch, duration, M21Obj
mv chord,interval,key,note,roman,scale
clef, renderOptions, tinyNotation
finish refactor w/ stream, dynamics
refactor music21Theory.js to m21theory
update version of vexflow
all tests in fundamentals
added jazzMidi
del requireMain; updated tests
clean up old test htmls
quint tests all pass
module level tests; base to m21p style
ps051 1/2 done
all 21m.051fa13 problem sets work
added articulations
remove old large files.