Configure for livereload

Been using grunt's livereload support for a couple of weeks to make life easier on a project at work and I do deeply dig it.

Just install one of the livereload [browser plugins](http://feedback.livereload.com/knowledgebase/articles/86242-how-do-i-install-and-use-the-browser-extensions-) and switch on when running `grunt watch`.

Auto-browser-stylesheet-reloady good-times.