Understandable error messages from uglifyjs
Check if windowResize argument is undefined

When loading nv3d without creating a chart, ```nv.utils.windowResize``` is called somewhere with an undefined argument, so we should check if it is undefined and not try to replace the old event handler, otherwise every resize event generates an error because ```fun``` is undefined.

I was able to produce  by including the following libs and triggering onresize events.

```
nvd3/lib/d3.v2.js
nvd3/src/core.js
nvd3/src/tooltip.js
nvd3/src/utils.js
nvd3/src/models/lineWithFocusChart.js
nvd3/src/models/legend.js
nvd3/src/models/axis.js
nvd3/src/models/line.js
nvd3/src/models/scatter.js
```

Sponsored-by: CentroNet Marketing
Add opt-in scatter point color override.
expose x-axis group spacing in multibar
correcting bug on heigth and width property accessors of stackedAreaChart
fix indent in example lineChart
add brushExtent to chart to enable the ability to set default focus range.

There is a brushExtent when init, so I guess maybe you guys just forgot to put the public function available.
Add ability to provide custom labels to bullet chart.
Change bullet labels check to be more idiomatic JS.
use style text-anchor vs attribute to maintain consistency with d3: https://github.com/mbostock/d3/blob/master/src/svg/axis.js#L69
added case 'none' to tooltip code
Merge branch 'development' of https://github.com/novus/nvd3 into development

Conflicts:
	nv.d3.min.js
update to tooltip positioning
Use style text-anchor to properly rotate ticks.
Rebuilding nv.d3.js
udpated indented tree to have links instead of handling click events
Merge branch 'development' of https://github.com/novus/nvd3 into development
Lighten bullet shading
Merge branch 'development' of https://github.com/novus/nvd3 into development
Major change to interactiveLayer.js. Instead of creating
a svg <rect> element to process mousemove events, we are
attaching the mousemove event to the bounding <svg> container.
This allows stackedAreaChart to maintain some previous interactivity.