title: Howto set custom ticks and labels on Y axis in nvd3
body: <p>I'd like to set custom tick number and labels for my discrete chart done in nvd3. The problem is that labels and values needs to be shown in ratios like 10:1, 8:1 etc. but actual bar height shown as numbers 10, 8 etc. Is there any way to create custom labels on y axis and on mouse over tool-tips in nvd3?</p>