correcting the glyphicons path on Gruntfile.js

Hey, Thomas!

I was having some problems to use the glyphicons from bootstrap. After a long time I noticed that Grunt creates a folder named dist where the fonts are loaded, so I changed on Gruntfile.js and worked perfectly.

Don't know if it happened to other people, but if it does, I hope it helps.

Great job with the generator, it has been very helpfull!