Words
Add rule: don’t omit optional closing tags

Example already showed not to omit optional closing tags, but it wasn't made explicit as a rule, even though it should be. :-)
Merge pull request #57 from KuraFire/patch-1

Add rule: don’t omit optional closing tags
Update index.html
add chinese translation
Merge pull request #60 from ZoomZhao/mdo/gh-pages

add chinese translation
Readme update for translations
Update README.md
Merge remote-tracking branch 'mdo/gh-pages' into gh-pages
Updates es.html file with the recent changes of the original guide