remove examples/wrapup

Apparently it's no longer relevant.
Clear error message when rendering a nonvalid component
Merge pull request #465 from matnel/bug388

Clear error message when rendering a nonvalid component
remove examples/wrapup

Apparently it's no longer relevant.
Merge branch 'rm-wrapup' of github.com:chenglou/react into rm-wrapup

Conflicts:
	package.json
Fix ReactDOMSelection for IE 11

IE 11 no longer supports the legacy document.selection API.
Their implementation of window.getSelection() doesn't support
the extend() method, which we were relying on.

If the selection is RTL and selection extend is missing, then just
flip the selection.
Oxford comma
Merge pull request #458 from chenglou/rm-wrapup

Remove support for the wrapup packager.
Update tutorial to use className
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!).