Aggregated pull requests

Thanks got from  arlm/nvd3
It aggregates:

novus/nvd3#62 Fix on severval bugs and typos
novus/nvd3#40 Fix bug of updateFisheye when you filtered out some data
novus/nvd3#23 Adjust tickLabel's on update rather than enter
novus/nvd3#21 Add variable for customization of donut pie chart
novus/nvd3#15 Adding d3.event to scatter event listeners
novus/nvd3#13 added lineTimeSeriesChart
novus/nvd3#9 Allow forceY on multiChart
novus/nvd3#6 Fixed rotateLabels option for multiBarCharts