Resolve "Implement ce_GEM"

Closes #11 (closed)

reference_detector.xml

@@ -114,7 +114,6 @@
   <include ref="reference_detector/vertex_tracker.xml"/>
   <include ref="compact/silicon_tracker.xml"/>
   -->
-  <!--
   <include ref="compact/cb_CTD_Si.xml"/>
   <include ref="ip6/beampipe.xml"/>
   <include ref="compact/ffi_ZDC.xml"/>
@@ -123,15 +122,12 @@
   <include ref="compact/hcal.xml"/>
   <include ref="compact/forward_rich.xml"/>
   <include ref="compact/ce_mrich.xml"/>
-  -->
   <include ref="compact/ce_GEM.xml"/>
-	  <!--
-  <include ref="compact/roman_pots.xml"/>
-	  -->
   <!--
-  <include ref="eic/forward_ion_beamline.xml"/>
+  <include ref="compact/roman_pots.xml"/>
   -->
-	  <!--
+  <include ref="eic/forward_ion_beamline.xml"/>
+  <!--
   -->
 
   <detectors>