added mathjax to hooks in mathml.js and as an example book at mathml.js
Merge pull request #65 from futurepress/mathjax

Loading MathJax in a hook
Update readme with test books
Merge branch 'master' of github.com:fchasen/epub.js
update mathjax to wait to display content until end signal
Adds fullscreen support to Epub.js controls via screenfull.js.