Added drum-track display option to mid2svg.
Added drum-track display option to mid2svg.

leahjean/Music-Website,jimfinnis/angortplugins,jimfinnis/angortplugins,leahjean/Music-Website,leahjean/Music-Website,craigsapp/midifile,jimfinnis/angortplugins,jimfinnis/angortplugins