Steps to reproduce

1. View Link http://jsfiddle.net/jnfsekpg/1/

Expected behaviour

Should only have tick values displayed for integer values with tick marks shown at 0.5 increments.

Actual behaviour

Shows tick values at 0.5 steps. If showTicks is false then tick values are only displayed for integer values, but no tick mark is shown for 0.5 increments.