make TiledImageStore.Fixed have a "metadata" property that it loads from trackData.json that can contain various data about the images. will use this to store the wiggle min and max values.
make TiledImageStore.Fixed have a "metadata" property that it loads from trackData.json that can contain various data about the images. will use this to store the wiggle min and max values.

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