Format method table in README

Drop a column to prevent scrolling when viewed on GitHub.

![screen shot 2013-11-30 at 7 05 03 pm](https://f.cloud.github.com/assets/865/1649747/ad58639c-5a24-11e3-983d-9167fd01a50e.png)


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Thanks for this project @adelevie. Hopefully you'll find this patch useful.