Switch Columbia build setting to master branch

Change-Id: I9a0df4c5750a9d8ef1c49d1fb1396f1c98863b62
diff --git a/columbia.xml b/columbia.xml
index c1d9cd3..9375677 100644
--- a/columbia.xml
+++ b/columbia.xml
@@ -20,7 +20,7 @@
     </project>
 
     <!-- BEGIN Build system -->
-    <project name="build" path="build" revision="columbia" >
+    <project name="build" path="build" >
       <linkfile src="Makefile" dest="Makefile" />
     </project>
     <!-- END Build system -->