Move casajar files to common

extensions/common/casajar/content/casaOverlay.xul

@@ -0,0 +1,13 @@
+<?xml version="1.0"?>
+
+<overlay id="nslwebssoOverlay"
+         xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+
+// This imports our javascript.
+
+<script type="application/x-javascript" src="chrome://casa/content/casaOverlay.js">
+
+</script>
+
+</overlay>
+