refactor(*): removing unused vars

[jbedard]

No description provided.

[rodyhaddad]

I tried making js-hint do this manually so grunt ci-checks pick these up in the future, but didn't have much luck (jshint was warning about things like $InterpolateProvider never being used, even when run against build/angular.js)

So I merged this in for now, but it would be nice to have this task automated (and ported to 1.2.x)

[caitp]

I thought I said "lgtm" from my phone a while ago, guess not =) good stuff @jbedard

[jbedard]

After finding one of these I added the jshint option and found a bunch more, but I could have missed more between all the $interpolateProvider and similar, and I only ran jshint:ng. I took a quick look and couldn't find any easy way to allow some globals as exports such as $interpolateProvider while still catching others. The only thing I can think of is adding /* jshint unused:false */ all over the place...