chore(build): add saucelabs cloud browser testing

Travis will now test ios, android, ie10, and firefox latest.

I had to modify a few tests to make things work in ie10 (#95)

The only downside of this is that the travis build takes about twenty minutes now, to connect to and boot up browsers on saucelabs.  But I think it's worth it.

Be sure to bower install again, I changed angular-scrolly dependency to be the one on bower (angular-scrolly versus ajoslin/angular-scrolly) - since I released a new version of it.