Merged HEAD (5.2) to 5.2.N (5.2.1)

127589 jkaabimofrad: Merged API-STRIKES-BACK (5.2.0) to HEAD (5.2)
      127094 jvonka: Node Associations - child assocs - isPrimary filter (for /parents and /children)
      - RA-1053


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/BRANCHES/DEV/5.2.N/root@127681 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/rest/api/Nodes.java

@@ -263,4 +263,6 @@ public interface Nodes
 
     String PARAM_VERSION_MAJOR = "majorVersion"; // true if major, false if minor
     String PARAM_VERSION_COMMENT = "comment";
+
+    String PARAM_ISPRIMARY = "isPrimary";
 }