Now checks trackList.json for color of track labels.
Now checks trackList.json for color of track labels.

closes #4

To use, change the track so it looks something like:

{
"chunkSize" : 20000,
"urlTemplate" : "seq/{refseq}/",
"label" : "DNA",
"type" : "SequenceTrack",
"key" : "DNA",
"style" : {
"trackLabelCss" : "background-color: red"
}
},

SuLab/jbrowse,nathandunn/jbrowse,Arabidopsis-Information-Portal/jbrowse,limeng12/jbrowse,limeng12/jbrowse,igemsoftware/Shenzhen_BGIC_0101_2013,GreggHelt2/apollo-test,igemsoftware/Shenzhen_BGIC_0101_2013,igemsoftware/Shenzhen_BGIC_0101_2013,GMOD/jbrowse,limeng12/jbrowse,Arabidopsis-Information-Portal/jbrowse,Arabidopsis-Information-Portal/jbrowse,GreggHelt2/apollo-test,limeng12/jbrowse,Arabidopsis-Information-Portal/jbrowse,limeng12/jbrowse,igemsoftware/Shenzhen_BGIC_0101_2013,nathandunn/jbrowse,GMOD/jbrowse,erasche/jbrowse,Arabidopsis-Information-Portal/jbrowse,Arabidopsis-Information-Portal/jbrowse,igemsoftware/Shenzhen_BGIC_0101_2013,SuLab/jbrowse,GMOD/jbrowse,nathandunn/jbrowse,GreggHelt2/apollo-test,Arabidopsis-Information-Portal/jbrowse,erasche/jbrowse,SuLab/jbrowse,GMOD/jbrowse,SuLab/jbrowse,erasche/jbrowse,limeng12/jbrowse,SuLab/jbrowse,erasche/jbrowse,igemsoftware/Shenzhen_BGIC_0101_2013,nathandunn/jbrowse,erasche/jbrowse,igemsoftware/Shenzhen_BGIC_0101_2013,SuLab/jbrowse,nathandunn/jbrowse,erasche/jbrowse,GreggHelt2/apollo-test,igemsoftware/Shenzhen_BGIC_0101_2013,SuLab/jbrowse,GreggHelt2/apollo-test,erasche/jbrowse,limeng12/jbrowse,GreggHelt2/apollo-test,erasche/jbrowse,limeng12/jbrowse,GMOD/jbrowse,GreggHelt2/apollo-test