Update CodeMirror to latest upstream master

Narciso Jaramillo · Narciso Jaramillo · commit 8365b0aba6ec · 2012-12-19T09:07:31.000-08:00
diff --git a/src/thirdparty/CodeMirror2 b/src/thirdparty/CodeMirror2
@@ -1 +1 @@
-Subproject commit 836e16adcdb7aa732db35889bfc229755dca282d
+Subproject commit 4ac070612f32e98de11a2b464e3c34ea246d6eeb
