Gridlines for horizontal bar chart are out of bound of the chart

[hkumar1993]

[hkumar1993]

[hkumar1993]

Also tested on JS fiddle with the example bar chart
http://jsfiddle.net/gh/get/jquery/1.11.0/forio/contour/tree/master/examples/showcase/bar/bar-basic
Just add

chart: { gridlines: 'both' } 

to the options and you will see the same behavior