bump CodeMirror to 5.10.

bower.json

@@ -24,7 +24,7 @@
         "amber": ">0.14.17",
         "amber-contrib-web": ">=0.1.0",
         "jquery-ui": ">=1.9.2",
-        "codemirror": "^4.7.0",
+        "codemirror": "^5.10.0",
         "require-css": "^0.1.2"
     },
     "devDependencies": {