Bumping package to version 3.0.0

Tagging 2.3.1

Merge pull request mdarnall#15 from mdarnall/custom-functions

Add support for node-sass functions

Updated package.json for v2.2.0 release

Merge pull request mdarnall#10 from mdarnall/2.1-wip

version 2.1.0

Merge pull request #6 from mdarnall/2.0-wip

2.0 feature work

Tagging 1.0.0