Edited Feature: default odata routing conventions is missing support for url's generated by WCF DS client [797]

The following odata uri templates are not supported and WCF DS client generates them.

1) PUT or POST ~/entityset/key/cast/$links/navigation - CreateLink with inheritance.
2) POST ~/entityset/key/navigation - AddRelatedObject
3) POST ~/entityset/key/cast/navigation - AddRelatedObject with inheritance.