Gruntfile.js: Remove extra comma.
Gruntfile.js: Remove extra comma.

BS3 commits: 299f985e5d453c2a6b1202bbc545d83f84b09360

up2vs/todc-bootstrap,ztx1491/todc-bootstrap,todc/todc-bootstrap,todc/todc-bootstrap,2947721120/googlebt4,aaroncnhk/todc-bootstrap,mozillo/todc-bootstrap,2947721120/todc-bootstrap,todc/todc-bootstrap