Cleaned up AMD support comments.
Upgraded grunt-contrib-copy to version 0.5.
Upgraded grunt-contrib-jshint to version 0.8.
Bumped copyright year to 2014.
Enabled the JSHint freeze option.

This recently added option will generate an error when attempting to
modify native objects.
Upgraded grunt-contrib-compress to version 0.6.
Upgraded grunt-contrib-uglify to version 0.3.
Upgraded grunt-contrib-qunit to version 0.4.