Merge pull request #30 from jephir/master

Add main element, forget to merge.....
Add 'main' in html complete
Fix javascript syntax group name
Use keyword for aria support
Fix #33, add data tag

http://www.whatwg.org/specs/web-apps/current-work/multipage/text-level-semantics.html#the-data-element
Add 'template' element

http://www.w3.org/TR/html-templates/#template-element