Add support for deleting or patching all items of a collection.

[SteveIves]

The OData 4 spec states that “ To apply a PATCH or DELETE request to each member of a collection, clients append the path segment /$each to a resource path identifying a collection.”. We should add support for this.

http://docs.oasis-open.org/odata/odata/v4.01/odata-v4.01-part2-url-conventions.html#sec_AddressingEachMemberofaCollection

Need to figure out if the underlying OData library supports this.

[theplasmastorm]

This is currently not supported in current OData.net libraries. $filter may be a support path for this, but it may require a custom routing convention