grunt-groc bug? had to npm UNinstall groc and use groc from my global
install or else "grunt groc" failed on a Jade deprecation warning. so,
removed groc (but not grunt-groc) from package.json, even though groc is
still a dev dependency. also fixed some jshint things.
fixed bugs that jshint encouraged me to add
getting demo working
add multi dimensional grouping by sending an array of dimensions. added
leafNodes() to groups. fixed it to use underscore-unchained.
lots of work on a demo
added some tests after a bunch of library changes