The documentation for Phaser.Rope is incorrect.

Though I have no idea how to correct it. In this pull request I have removed the variables from the doc which are obviously not used. I have also added a stub for the the parameter points. Someone just have to explain what points is supposed to be.

If someone could provide a working example of a rope in use that would be great, got a codepen going [here](http://codepen.io/anon/pen/eswGc?editors=001).