Resolve "Implement ci_GEM"

Closes #20 (closed)

compact/ci_GEM.xml

 <lccdd xmlns:compact="http://www.lcsim.org/schemas/compact/1.0" 
        xmlns:xs="http://www.w3.org/2001/XMLSchema" 
        xs:noNamespaceSchemaLocation="http://www.lcsim.org/schemas/compact/1.0/compact.xsd">
->
 
   <!-- Some information about detector  -->
   <info name="Central Ion GEM" title="Central Ion GEM"
@@ -16,8 +15,8 @@
   <includes>
   </includes>
 
-  <!-- Define the dimensions of the world volume
   <define>
+  	<!--
     <constant name="ci_GEM_id"      value="1">
     <constant name="ci_GEM_rin"     value="10 * cm">
     <constant name="ci_GEM_rout"    value="95 * cm">
@@ -26,8 +25,8 @@
     <constant name="ci_GEM_posz"    value="0 * cm">
     <constant name="ci_GEM_posx"    value="0 * cm">
     <constant name="ci_GEM_nlayers" value="8">
+    -->
   </define>
-  -->
 
    <limits>
   </limits>
@@ -58,4 +57,6 @@
   </detectors>
 
   <plugins>
-  </plugins>
+  </plugins>
\ No newline at end of file
+
+</lccdd>
\ No newline at end of file