Saucelabs

close #673 

Here's the saucelabs testing. It works with travis when we push. I fixed some tests for other browsers while I was doing this, but I wasn't able to fix IE9 tests (I was getting about 40 errors for that). It passes on firefox, chrome and IE10. 

I'll try to fix IE9 separately from this PR.

I modified some legend and label code to add some more margins so the tests would pass on different browsers.
I'll make a `test-sauce` and `test-local`, and `grunt test` will just run both of those.