use keymaster instead of ace for keybindings.

keybindings now work anywhere in the window, not just when ace has
focus!

src/keybinder.coffee

@@ -1,11 +1,7 @@
 ace = require 'ace/ace'
 canon = require 'pilot/canon'
 
+key = require 'keymaster'
+
 exports.bindKey = (name, shortcut, callback) ->
-  canon.addCommand
-    name: name
-    exec: callback
-    bindKey:
-      win: null
-      mac: shortcut
-      sender: 'editor'
+  key shortcut, -> callback(); false