fix line chart performance issue (https://github.com/novus/nvd3/issues/691)
Merge pull request #218 from NFLabs/line-chart-y-axis

fix line chart performance issue (https://github.com/novus/nvd3/issues/6...
Fix selection bg color
Merge pull request #223 from NFLabs/fix/selection_background_color

Fix background color for selected words, selected autocompletion list