REPO-1506: Update Person - implement

- added implementation for update personService
   - added tests

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/BRANCHES/DEV/5.2.N/root@132117 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

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

@@ -52,5 +52,12 @@ public interface People
      */
     Person create(PersonUpdate person);
 
-    //Person updatePerson(String personId, Person person);
+    /**
+     * Update the given person's details.
+     * 
+     * @param personId The identifier of a person.
+     * @param person The person details.
+     * @return The updated person details.
+     */
+    Person update(String personId, Person person);
 }