Upgrade to v2

This is my w.i.p. for upgrading to support less.

Please feel free to contribute changes to the branch or add review comments etc. I may be experienced with less, but I'm not super experienced with grunt-contrib-less
do we remove using maxmin or alternately I guess we could use our own plugin to find out the size of the css before any css compress plugins run.. but not sure what the point is.. autoprefixer would add to the size, do you show that?