Test Grunt Tasks and Commands

[jtfairbank]

Perhaps I should write a set of tests to verify the Grunt configuration at a high level. These will also help demonstrate how the build process works.

Ideas:

1. A shell script that verifies the layout of src/, then runs grunt build, then verifies the output file structure in build/.
2. A script that runs through all grunt tasks, to ensure that each command is used at least once (discovers dead commands).