Load snippets from TextMate bundles

There's still a bunch of holes in this. TextMate snippets have features
that we don't support yet. But the basic ones should now work.

src/stdlib/fs.coffee

@@ -184,3 +184,11 @@ module.exports =
       CoffeeScript.eval(contents, bare: true)
     else
       JSON.parse(contents)
+
+  readPlist: (path) ->
+    plist = require 'plist'
+    object = null
+    plist.parseString @read(path), (e, data) ->
+      throw new Error(e) if e
+      object = data[0]
+    object