SauceLabs harness for unit-tests

Hey,

So here is the minimal structure for running unit tests in SauceLabs on the sauce-connect tunnel.
Run `npm install`, 
Add your SauceLabs credentials to your environment
```bash
export SAUCE_USERNAME=<SAUCE_USERNAME>
export SAUCE_ACCESS_KEY=<SAUCE_ACCESS_KEY>
```
then test with 
```bash
grunt test:unit
```

I've put in two browsers: `[linux,chrome,latest], [Win7, internet explorer, 8]`
One html page which runs the tests (with mocha)
And one spec file which gets loaded by the above html

I made it so that **two tests succeed** and **one test fails specifically in IE8**.

More to follow soon...