Script async and defer properties
tutorial: Simplify ajax options

dataType was unnecessary; mimeType was both unnecessary and wrong in this case. Also removed an unnecessary bind and changed pollInterval to 2000 ms for consistency with https://github.com/petehunt/react-tutorial (faster is nicer if you actually try it out!).
Remove jQuery version number from tutorial docs
Merge pull request #472 from lrowe/patch-4

Script async and defer properties
blogify
make props/state section less intense
rename
rename