Added fixes for following issues:
base-controller.xqy - request:body() returns empty binary() that thwarts params being passed over empty body
domain.xqy - An abstract model which references a physical model causes references to cause errors when deleting.
Merge branch 'master' of https://github.com/nativelogix/xquerrail2.framework

Conflicts:
	src/main/_framework/domain.xqy