Fixed rotateLabels option for multiBarCharts

Replaced 'text-transform' with correct attribute 'text-anchor' to set
rotation center of labels.
Adjust axis labels on update rather than enter.

This allows an axis to change orientation and have the tick label respond accordingly.
Issue #73 Error: Invalid value for <rect> attribute y="NaN", height="NaN"
Use the formatter that belongs to yAxis of the series to format the y value of a tooltip, instead of basing it on the series chart type.
Multi bar chart legend width computed with 'showControls' respect
add property for label radius
keep the size of pie chart when change the svg size
Add support for startAngle and endAngle on pie chart
add key description to display in tooltip
undo the size change
Minor fix to scatter to allow all series to be disabled and padData set to true without error
Fixed padData on scatter, added padDataOuter to account for outerPadding on ordinal scales
Made state.disabled always set on charts that keep state
Added parallelCoords.js model from the NYC d3.js meetup
Added filter functionality to indentedtree model (can be used to filter values besides zero)
Merge branch 'changes' of https://github.com/pfeffer/nvd3 into pfeffer-changes
merged pfeffer's pull request, also updated indented tree zerofilter
Merge pull request #93 from bertrandchenal/master

Add support for startAngle and endAngle on pie chart
Merge pull request #78 from michalkutil/multiBarChart-legendWidth

Multi bar chart legend width
Merge pull request #75 from wvanbergen/master

Tooltip formatting bugfix