Addressed issue with path chaining in canvas implementation of graphics. Fix #1565
[dom] Normalize setting a node value to null

When set a node value to `null`, then a node value returns `"null"` as string
on the legacy IE (IE <= 9). A node value returns an empty string on the modern
browsers (Chrome, Firefox, IE >= 10). This change is to normalize the results
of setting a node value to `null` on any browsers. Fix #1603.
[Log] Provide a default log category for Y.log calls

Set a default log category of info if no category was specified, or the
category specified is not in the list of valid categories.
[node] Remove the obsolete name param of toggleView method for API docs

Fix #1478.
use visibility:inherit to allow overlays to be hidden
update change log
Fixes #1632
Merge branch 'fix1603' into dev-master
[dom] Build

min files are no change.
[node] Remove the obsolete name param of toggleView method for API docs

Fix #1478.
Merge branch 'fix1478' into live-docs
[node] Build

min files are no change.
Merge branch 'live-docs' into dev-master

Conflicts:
	build/node-style/node-style-coverage.js
[docs] Increase wait time for GH contributors test
Merge branch 'issue1565' into dev-master
Grahics build files.
Add YUI coverageOptions for Yeti.

 - Do not instrument files in Yeti.
 - Use ?filter=coverage query to trigger loading instrumented
   files in tests.

Allows for `yeti -c` to use these options without specifying
them on the command line.
[docs] Add mock data to JSONP Gallery example
[docs] Add mock data to JSONP GitHub example
Merge branch 'mock-jsonp-examples' into dev-master