Make labels optional. Allows for a chart that has neither labels nor a legend.
Allow the color palette to be customized.

The colors setter takes a function that will either be passed the index of the data or the data element and its index based on the arity of that function.
Merge pull request #3 from tafsiri/configurable-color

Allow the color palette to be customized.
Merge pull request #2 from tafsiri/optional-labels

Make labels optional. Allows for a chart that has neither labels nor a legend
Merge branch 'master' into stroke-width

Conflicts:
	dist/pie.js
	lib/pie.js