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
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
Extend the timeout of a flaky batch test. Addresses #637

Also change the test value from a string to a number as it should have
been to avoid possible failures
Fix incorrect mention to callbacks in Y.batch API docs

This was a left-over from the previous implementation
Seed and loader bump for gallery build.
Merge branch 'contrib' into dev-master
Merge branch '2533197' of git://github.com/Satyam/yui3-1 into Satyam-2533197
Merge branch 'node-hidden-accessibility' of git://github.com/gerardkcohen/yui3 into gerardkcohen-node-hidden-accessibility
Update node history.
Build node-base.
Fix #673: Fix missing em close tag
Merge pull request #674 from okuryu/fix-#673

Fix #673: Fix missing em close tag