Assign $windowNumber in index.html

src/app/window.coffee

@@ -1,8 +1,6 @@
 # This a weirdo file. We don't create a Window class, we just add stuff to
 # the DOM window.
 
-$windowNumber = window.location.params.windowNumber
-
 Native = require 'native'
 TextMateBundle = require 'text-mate-bundle'
 TextMateTheme = require 'text-mate-theme'

static/index.html

@@ -11,6 +11,7 @@
           var pair = param.split("=")
           window.location.params[pair[0]] = pair[1];
         });
+        window.$windowNumber = window.location.params.windowNumber
         var bootstrapScript = window.location.params.bootstrapScript;
         if (bootstrapScript) require(bootstrapScript);
       }