Updated to Grunt 0.4.x
Merge pull request #123 from SpiderOak/update-Grunt

Updated to Grunt 0.4.x

A few notes, for those upgrading:
* If you have grunt globally installed, you need to do `npm install grunt-cli`.  (You may need to grant your account with write access to /usr/local/bin/grunt and /usr/local/lib/node_modules.)
* The command that was `grunt lint` is now `grunt jshint`.
* The file that was `grunt.js` is now `Gruntfile.js`.