Initial commit of files with offsite demo

This demonstrates a proof-of-concept where xapi statements can be put into markup of a file and parsed by unobtrusive javascript. The intent is to put more power into the hands of content creators with little need to write any custom code.

In cases where you cannot rely on javascript to be present, but should not limit a learner's access to content, such as ebooks, this approach of graceful degradation is applicable.

Please reference the TODO at the bottom of the demo index.html for more information about where development currently stands.