Have DomElementSchemaRegistry support namespaced elements,
so that it does not fail when directives are applied in SVG (or xlink).
Without this fix, directives or property bindings cannot be
used in SVG.
Related to #5547Closes#5653
This is part of ongoing work to make core platform-independent.
BREAKING CHANGE
All private exports from 'angular2/src/core/facade/{lang,collection,exception_handler}' should be replaced with 'angular2/src/facade/{lang,collection,exception_handler}'.
