PJAX & caching

PJAX & caching

http://albertoconnor.ca/blog/2013/Jan/22/pjax-vs-json
https://github.com/defunkt/jquery-pjax
http://37signals.com/svn/posts/3112-how-basecamp-next-got-to-be-so-damn-fast-without-using-much-client-side-ui

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