Support custom chart option.id

[stowball]

nvd3 supports custom IDs, but your Angular version didn't.

From the docs:

Description:

Applies the provided ID as part of the unique class name for the chart. For tooltip, this value is read-only. For charts, you can use this to specify custom CSS for particular charts. For example, if you set the chart to have id 'woot', you can customize the CSS using the selector .nvd3.nv-chart-woot

Input Type(s):

number or string

Default:

A random ID is generated by default

Example(s):

chart.id(123)
chart.id("chart56")

[pertrai1]

@stowball I don't know if you are still using this, but if so, there is a new repo that is going to continue to maintain development: https://github.com/pertrai1/angular-nvd3-charts