[eclipselink-dev] Checkin for bug 219496

[Matt MacIvor <matt.macivor@xxxxxxxxxx>]

https://bugs.eclipse.org/bugs/show_bug.cgi?id=219496

Issues with using Inheritence in OXM with a default namespace.

Changes:
-QNameInheritencePolicy now checks for a default namespace for 
non-prefixed indicators.
-Changed UnmarshalRecord's namespace map to store URIs in a Stack to 
avoid loss of information when a prefix is temporarily redefined.
-Added tests

Tests: new JUnit tests added
Reviewed By: David McCann

-Matt