Alias meta to cmd in keymaps

src/browser/application-menu.coffee

@@ -137,6 +137,7 @@ class ApplicationMenu
     modifiers.push("Shift") if key != key.toLowerCase()
     modifiers = modifiers.map (modifier) ->
       modifier.replace(/shift/ig, "Shift")
+              .replace(/meta/ig, "Command")
               .replace(/cmd/ig, "Command")
               .replace(/ctrl/ig, "Ctrl")
               .replace(/alt/ig, "Alt")

src/key-binding.coffee

@@ -16,6 +16,7 @@ class KeyBinding
       keys = @getParser().parse(keystroke)
       modifiers = keys[0...-1]
       modifiers.sort()
+      modifiers = ((if m == 'meta' then 'cmd' else m) for m in modifiers or [])
       [modifiers..., _.last(keys)].join('-')
     normalizedKeystroke.join(' ')