Use grunt-sass to remove Ruby requirement

Removes Ruby Sass dependency from the build. grunt-sass uses the [node-sass](https://github.com/andrew/node-sass) platform specific bindings to [libsass](https://github.com/hcatlin/libsass). node-sass currently gets rebuilt on `npm install` for OSX/Linux, but there is a pending PR that will remove that unless the native bindings have a problem.

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The packag.json repository and name change were to remove warnings when running