change numeric track.mode value to keywords in buggy IE10 (fixes issue  Issue #172)
change numeric track.mode value to keywords in buggy IE10 (fixes issue  Issue #172)

cl4rke/webshim,cl4rke/webshim,fashionsun/webshim,fashionsun/webshim,ilovezy/webshim,aFarkas/webshim,ilovezy/webshim,fashionsun/webshim,tomascassidy/webshim,aFarkas/webshim,tomascassidy/webshim,webdev1001/webshim,webdev1001/webshim,pablogrela/webshim,webdev1001/webshim,ilovezy/webshim,cl4rke/webshim,pablogrela/webshim,tomascassidy/webshim,aFarkas/webshim,pablogrela/webshim