DijitRegistry: add proper resize handling
Clean up dijit_layout test pages a bit
DijitRegistry: add props/methods for compat as child of layout widgets
Update dijit_layout test pages to test dgrid as direct layout child
Merge branch 'dijit-resize' of git://github.com/kfranqueiro/dgrid into dijit-resize

Conflicts:
	test/dijit_layout_programmatic.html
DijitRegistry: initialize layoutPriority to prevent IE<8 errors in BC
Add DijitRegistry improvements to CHANGES.md