Fix #1472
fix FF contenteditable backspace bug.
https://github.com/yui/yui3/issues/1376
Allow for rgba value for fill and stroke in the vml implementation. Fix #1534.
Added test for vml stroke/fill color rgba.
tweaks per YUI team advice on pull request.

https://github.com/yui/yui3/pull/1502
tweaks per YUI team advice on pull request.

https://github.com/yui/yui3/pull/1502
Addressed issue with path chaining in canvas implementation of graphics. Fix #1565
[timers] Use asap.js
[timers] Add asap license to YUI license
[timers] Add soon._impl back
[timers] Mention asap.js in the module's description
Tidy up log calls in event

This reduces the category of some noisy log events, adds a category to
those missing one, and removes a number of commented-out calls.
[Loader] : Update five tests.
[Loader] : Rewrite of `_sort`.
[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.
[History] : Remove `history-hash-ie`  from roll up.
[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.
tweaks per https://github.com/yui/yui3/pull/1502/files#r8857828
tweaks per https://github.com/yui/yui3/pull/1502/files#r8852815
[core] Fix coverage tests

The original coverage tests used yui-core-coverage and loaded the rest
of yui-base by inserting script tags. This seems to have been set up
that way to get more granular coverage information than just one entry
for yui-base, but it is causing YUI.add to fail in certain cases because
Loader is not yet available. This changes the coverage test to do the
same as the regular unit tests.