Update request module and node engine requirements
Remove path.existsSync as part of node 0.8 minimum environment
Update IO history
Update core history
Build YUI for merge of #924
Merge branch 'request-update' of git://github.com/clarle/yui3 into dev-master
YUI and Loader build for latest Gallery build
Fixed API doc for EventTarget fire method

As per http://yuilibrary.com/projects/yui3/ticket/2532950 the return
value of the fire event was corrected.
Build event-custom-base. Doc changes only.
Merge branch 'live-docs' into dev-master