remove examples/wrapup

Apparently it's no longer relevant.
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