Adding HISTORY.md entries for 3.10.0
Update HISTORY.md

Adding entry for https://github.com/yui/yui3/commit/778c72b1943f425cc3a6238db56192aeec95a296
added entry for "revert EventTarget back..."
added entry for node-deprecated removal
added entry for dom-deprecated removal
add entry for italian language files update.
updated entry based on DD checkin.
update entry based on Handlebars checkin.
Increase some timeouts and remove time-based assertions from tests other than duration.
Resolve conflict with dom HISTORY.