Merge pull request #1 from masayuki0812/master

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Merge pull request #2 from masayuki0812/master

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Merge pull request #3 from masayuki0812/master

Add id for data.labels.format - #190
Add data.color API - #177
Update sample for data.lable.format
Fix legend positioning - #176
charts now look much sharper

To get everything looks sharper, move the main container 0.5 pixels in each direction. It's a known issue on D3 (check http://mbostock.github.io/d3/tutorial/bar-2.html). Half-pixel offsets disable anti-aliasing.

Additionally, some values gets rounded and some elements get sharpened by CSS.

Know bugs:
- grid-lines sometimes have an offset of 1px
- does not work after windows.resize
Fix data.names API - #150
Add padding.top/bottom and fix transition of axis label - #193
Add sample for padding
Wrap rect for region by g - #194
Accept min/max of axis x in axis.min/max - #202
Fix x domain when only 1 data on category axis - #201
Fix grid lines - #204
Introduce c3_axis - #204
Fix grid on smoothing - #204
Remove Math.ceil not needed - #204
Fix conflict and jslint
Update version to 0.1.35