REPO-1390 , REPO-1391: Add support for retrieving site presets

-  Implemented the API;
   -  Added automated tests.


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/BRANCHES/DEV/5.2.N/root@131764 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

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

@@ -77,4 +77,5 @@ public interface Sites
 
 	String PARAM_SITE_ROLE = "role";
     String PARAM_VISIBILITY = "visibility";
+    String PARAM_PRESET = "preset";
 }