Add require('lodash') to pubsub/index.js.

This is required when globals._ is set to false.
Update grunt-contrib-less to a recent version
Merge pull request #1362 from jaulz/patch-1

Update grunt-contrib-less to a recent version
Merge pull request #1351 from leedm777/pubsub-lodash

Add require('lodash') to pubsub/index.js.
Merge master.