WCAG2 aggregation

I've started to develop aggregation for WCAG 2 for the KING monitoring platform. The basics are in now and will create an object containing WCAG aggregated data in an earl format. I've created the examples/simple/wcag2.htm file for testing and as a demo. Everything is logged to console there.

I wasn't sure about ES5 support, so I've stuck to ES3 safe methods (which is why there is a lot of jQuery loops). The resulting data is still missing a few earl requirements. Particularly the pointer. Stacking clusters also still need to be developed, though they are not too different from combined clusters. But some refactoring is required first.