fixing bug with offset in Axis
fixing bug with offset in Axis

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