make JBrowse/Model/DataView not crash on load in browsers that don't have typed arrays
make JBrowse/Model/DataView not crash on load in browsers that don't have typed arrays

nathandunn/jbrowse,erasche/jbrowse,Arabidopsis-Information-Portal/jbrowse,igemsoftware/Shenzhen_BGIC_0101_2013,Arabidopsis-Information-Portal/jbrowse,Arabidopsis-Information-Portal/jbrowse,GMOD/jbrowse,GMOD/jbrowse,igemsoftware/Shenzhen_BGIC_0101_2013,limeng12/jbrowse,nathandunn/jbrowse,GMOD/jbrowse,nathandunn/jbrowse,limeng12/jbrowse,Arabidopsis-Information-Portal/jbrowse,GMOD/jbrowse,erasche/jbrowse,limeng12/jbrowse,igemsoftware/Shenzhen_BGIC_0101_2013,nathandunn/jbrowse,erasche/jbrowse,igemsoftware/Shenzhen_BGIC_0101_2013,limeng12/jbrowse,igemsoftware/Shenzhen_BGIC_0101_2013,igemsoftware/Shenzhen_BGIC_0101_2013,erasche/jbrowse,GMOD/jbrowse,erasche/jbrowse,Arabidopsis-Information-Portal/jbrowse,limeng12/jbrowse,nathandunn/jbrowse,limeng12/jbrowse,igemsoftware/Shenzhen_BGIC_0101_2013,erasche/jbrowse,erasche/jbrowse,Arabidopsis-Information-Portal/jbrowse,limeng12/jbrowse,limeng12/jbrowse,Arabidopsis-Information-Portal/jbrowse,erasche/jbrowse,igemsoftware/Shenzhen_BGIC_0101_2013