Merge pull request #4 from masayuki0812/master

Update fork
bring back sharp axes/grids (fix #204)
fixed mixed spaces & tabs
removed linebreak
Fix axis z-index
Fix grids
Fix conflict
Remove Math.ceil for height2 and define function for half pixel - #213
Fix transition for regions when data loaded
Fix conflict for merge
Fix zoom and grids on category axis
Fix select/unselect API for index 0 data - #214
Fix horizontal axis clip - #211
Update version 0.1.36