Fix default color to use d3 color pattern
Remove class 'c3' when destroy() called - #233
Fix error when mouse over with data.names - #197
Fix line with null on sub chart - #229
Fix tooltip position on the edge - #234
Fix event rect for timeseries - #225
Fix check type for pie/donut - #227
Fix trivial
Fix data label position on arc
Fix y padding when formatted - #231
Skip text for data label when it's off
Skip circle when point.show is false
Fix event rect when width < 1
Enable to get element without bindto - #208
Fix parent width - #241
Fix update of legend when svg hidden - #241
Add c3.flush API
Fix unexpected transition for legend when inserted as element
Fix line with region
Fix half pixel of axis ticks