Updating dependencies and other general updates to the package

Closes #7 

- chai-1.8.1 -> 1.9.1
- grunt-0.4.1 -> 0.4.5
- grunt-complexity-0.1.3 -> 0.2.0
- grunt-contrib-jshint-0.7.0 -> 0.10.0
- grunt-mocha-test-0.7.0 -> 0.11.0
- mocha-1.13.0 -> 1.21.0