Merge pull request #266 from ericf/master

Clean-up code block formatting
Make Get Started page work (fully) in IE9
Merge branch 'master' of github.com:yui/pure-site
Merge pull request #268 from ericf/start-ie9

Make Get Started page work (fully) in IE9
committed by screwdriver build
Bump Pure to v0.5.0
Bump version to v1.13.0