Align RPC names in tables and use consistent lowercase "bitcoin-cli"

(Some extreme nitpicking for better readability, feel free to pick what you like)

Screenshot:
![capture du 2014-12-20 23 46 35](https://cloud.githubusercontent.com/assets/3578089/5517188/98542c62-88a2-11e4-9b2d-06431208888a.png)