Fixed using numeric values as category names.
Fix conflict
Remove useless code for categories and update sample for categorized axis - #266
Merge branch 'jasonxunxu-master'
correcting typo in function name
adding label threshold for pie/donut
Arc of Gauge to expand on mouseover

I noticed that the mouseover effect of expanding and contracting was not happening with the arc gauge. I thought it was working before, and I don't know if it was taken out on purpose of left out during the refactoring of the arc portion of the code. Here is a fix that goes with the current code.
styling changes for #275

Here are the styling changes moved to c3.css regarding #275
Fix conflict
Merge branch 'dominicbarnes-label-threshold'
Merge branch 'patch-2' of https://github.com/bjlbernal/c3 into bjlbernal-patch-2
Merge branch 'bjlbernal-patch-2'
Update c3.min.js
Merge pull request #276 from bjlbernal/patch-4

styling changes Re: #275
Fix grids
Fix grid on flow
Fix grid.x.lines on flow
Fix data.labels on flow
Refactor empty selection
Fix region on flow