parser to produce melodic contour strings of files

#TODO
-add key signature detection
-add multi-track support (currently only midi file type 0 is supported)
-add melodic subsequence detection
-add string approximations
-add note data
-separate read into buildContour and buildNoteData
-deal with metaEvents in a more organized manner
-Python hooks to get melodic contour map from file...just call C from Python for web UI