Enhanced <rbs-document-list/> to accept a dynamic value (Angular binding) in the "collection-url" attribute.
Please note that the dynamic value must defined the entire value of the attribute: embedding Angular bindings in a string will lead to unwanted requests to the server.
Ex: this works: `<rbs-document-list collection-url="(= myCollectionUrl =)".../>`; this doesn't work: `<rbs-document-list collection-url="http://server/rest/query/(= myParam =)".../>`