Updated to Tycho-based platform build

*Updated Orbit dependency

Change-Id: I40a58951eef50a918e00640d1f1484bbcaf62173
diff --git a/releng/org.eclipse.graphiti.releng/build.rmap b/releng/org.eclipse.graphiti.releng/build.rmap
index c561cde..b1295bd 100644
--- a/releng/org.eclipse.graphiti.releng/build.rmap
+++ b/releng/org.eclipse.graphiti.releng/build.rmap
@@ -56,7 +56,7 @@
     <rm:provider componentTypes="eclipse.feature,osgi.bundle" readerType="p2" source="false" mutable="false">

       <rm:property key="buckminster.source" value="false"/>

       <rm:property key="buckminster.mutable" value="false"/>

-      <rm:uri format="{0}/tools/orbit/downloads/drops/S20130201140822/repository">

+      <rm:uri format="{0}/tools/orbit/downloads/drops/I20130308052141/repository">

         <bc:propertyRef key="eclipse.downloads"/>

       </rm:uri>

     </rm:provider>