Remove quick bug in add_axis and remove_axis
Remove quick bug in add_axis and remove_axis

SylvainCorlay/bqplot,ChakriCherukuri/bqplot,SylvainCorlay/bqplot,dmadeka/bqplot,bloomberg/bqplot,bloomberg/bqplot,ssunkara1/bqplot,rmenegaux/bqplot,ChakriCherukuri/bqplot,ChakriCherukuri/bqplot,dmadeka/bqplot,rmenegaux/bqplot,SylvainCorlay/bqplot,bloomberg/bqplot,ssunkara1/bqplot