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
Merge pull request #35 from jephir/add-template-element

Add 'template' element
<p> can omit end tag
Merge branch 'master' of github.com:othree/html5.vim
Fixing #25, supports most case
Fix #25, Remove option tag from omitabl list
Fix block start index
Remove #25 fix
Syntax add element
Complete add element
Indent add element
Add 'content' to syntax
Add 'content' to complete
Add 'element' attrs: name, extends
syntax add 'shadow'
Add 'shadow' to complete
Link rel='import'
Complete add 'is' attr
Syntax add 'is' attr