Add traceur runtime into page before eval-ing transpiled es6

I added traceur directly into this repository. I don't know if this is the ideal way to get it, or if it should be from npm. 

I created a script tag that injects the runtime and then evals the transpiled es6 afterward.

There can be some optimization done that would check if the runtime was already injected, but this should be a good start that does work.