Attempting upgrade of Grunt - not quite working

@elliotttf Could you look at this please? I have got it to 'work' in that I can run `grunt release` from the command line and it tells me that it all succeeds. However, some of the tasks maybe aren't working? Perhaps I did this wrong?

For reference:

http://gruntjs.com/upgrading-from-0.3-to-0.4