update grunt file to put everything in dist/dev and dist/prod. 

This pull gives us a dist folder similar to what was detailed in issue #21. The only difference is that I created a dev folder where css and js was not minified/compressed and a prod folder where they are. If everyone's OK with the changes I'll merge them.

Thanks,
Jon
I haven't looked at the way the sandbox currently holds files but as long as everything maintains the folder structure within the /dist folder this should work fine.