Editor: IE 11 no longer supports `document.selection`, in favor of `window.getSelection`.
Editor: Build.
[event-custom] Document defaultTargetOnly flag
Merge branch 'live-docs' into dev-master
Remove `X-Requested-With` info in XDR example

This is no longer necessary as using `xdr: native` will remove
all custom headers for you by default.
fix typo in docs
Merge branch 'dd-typo' of github.com:smikes/yui3 into smikes-dd-typo
Merge branch 'live-docs' into dev-master