Enable testing within IE6+

[bemson]

While Salt promises to work in IE6+, the tests don't...

This issue will track existing efforts to have testing frameworks work in IE6+:

• Mocha
• Chai
• Sinon

Working in IE8+ is acceptable.

[bemson]

Since Mocha, Chai, and Sinon don't work in anything less than IE10 - in some cases by design, this is an impossible feat.

Even when fixed, the tests will need to be rewritten. This should, at least, be noted in the readme. At best, a test app that demonstrates all the features would be useful.