Implemented callbackOnce flag in NodeList.transtion (issue 832)
Added test for callbackOnce flag
fixed formatting in transition unit test
fixed issue with the test, it would always pass if any callbacks were fired
changed the test to increment a counter and using a delayed wait to test
changed wording in unit test fail message
updated HISTORY.md with NodeList.transition optional flag info
Enforce a router's `root` as its mount point

This enforces routers with a specified `root` to only consider paths as
matching its route handles if that path is semantically within the
router's `root` path. For example:

    router.set('root', '/app/');

    router.hasRoute('/app/');    // => true
    router.hasRoute('/app/foo'); // => true
    router.hasRoute('/bar/');    // => false

This change fixes some issues with paths being erroneously considered
matching even when they were not semantically within the router's `root`
path.

The `getPath()` method now returns the _full_ current path, whereas
before it returned the current path relative to the router's `root`.

These changes will break backwards compatibility with some apps, but
fix some fundamental issues with how Y.Router handled `root` paths.

Fixes #1083
Update user guide and add HISTORY entry for Router mount point changes
Update hash-based routing test to check for the full path in `req.path`
Fix syntax highlighting in App's HISTORY.md
Add note about `req.path` being the full path in App's HISTORY.md
Flip arguments of Router#_pathHasRoot() method and fix unit test
YUI and Loader build for latest Gallery build
Merge branch 'dev-master' into dev-3.x
Revert test cases to only test the basic queue

It's not necessary to test both Flash and HTML5 in
these instances - those tests should be covered in
their own individual test suites.
Merge branch 'dev-master' into dev-3.x
Merge branch 'issue-832-trans-end' into dev-master
Update Transition HISTORY.md
Build Transition
Merge branch 'dev-master' into dev-3.x
Merge branch 'router-root' into dev-3.x