updated the grunt file for jscs and jshint

My pull request is only showing the most recent changes from my gruntfile.  I used the simple grunt exercise to update since there wasn't jscs or jshint in the original gruntfile.  My full updated grunt can be seen here.

Since I was testing a test file I had to add another simple js file to be tested by jscs and jshint to have all three tests pass.  So simplemocha passes the first file and then the next two tests pass the second file.    I need to learn how to add exceptions so that jscs and jshint could pass a test file.  Or ignore it altogether.

https://github.com/joeelsey/simplegrunt/blob/master/Gruntfile.js

Please let me know if you have any questions.