Add saucelab unit testing support

* Added encrypted details to travis config
* Created json file with list of browsers to test in
* Added relevant gruntfile updates
* I only run the basic tests no caniuse matching as it was difficult to get any browser passing for some reason.

## Known issues

* IE6 and Firefox won't run correctly I have open issues on saucelabs forums for these
* IE7, 8 & 9 have one test failing