CMIS Relationship support in AtomPub binding

- getRelationships
- getRelationship
- createRelationship
- unit tests for above

TODO: delete relationship, includeRelationships flag

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@14461 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/cmis/dictionary/CMISAbstractDictionaryService.java

@@ -276,6 +276,10 @@ public abstract class CMISAbstractDictionaryService extends AbstractLifecycleBea
         else
         {
             typeDef = getRegistry().typeDefsByQName.get(clazz);
+            if (typeDef == null)
+            {
+                typeDef = getRegistry().assocDefsByQName.get(clazz);
+            }
         }
 
         // ensure matches one of provided matching scopes