Fixes 2533197
Modified show/hide tests by checking for hidden attribute and added new test for toggle button
Updated example to use hidden attribute. Added toggleView example and example on how to check for visibility
Added toggle button to soure. Added condition to delegate for toggle button click event, and changed hide condition (line 30) to use identity operator instead of equality operator
Updated _show, _hide, and _isHidden methods to remove, set, and check hidden attribute, respectively. Updated comments to show new defaults and explain back-compat for useing style: display
Updated tests to use/ check for hidden attribute on node
Use Y.DateAssert in Calendar Tests
Update Calendar tests to check issue #2532163 #2532183 #2532185
Improve minimum/maximumDate Calendar feature. fix #2532163 #2532183 #2532185

Setting minimumDate or maximumDate now correctly disable nodes before
or after theses dates.
Update calendar documentation for the min/maxDate attributes
Fix Calendar navigator when min/max date change. #2532183
Added newline to eof of js/node-view.js and tests/unit/node.hhtml based on comments by ericf. Updated docs and example to include toggling of style.display property, as suggested by msweeney.
Merge branch 'master' of https://github.com/yui/yui3 into node-hidden-accessibility
Added contributors list
Linking to profiles
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