add model plugin back

Author: vladdu

features/org.erlide/feature.xml

@@ -145,4 +145,11 @@ is available from http://www.eclipse.org/legal/epl-v10.html
          version="0.0.0"
          unpack="false"/>
 
+   <plugin
+         id="org.erlide.model"
+         download-size="0"
+         install-size="0"
+         version="0.0.0"
+         unpack="false"/>
+
 </feature>