Use camel case.

[jfischoff]

The code basically uses camel case but use underscore in some places. Should just one, preferable the one the rest of the community uses.

ex. https://github.com/MarcosPividori/GSoC-Communicating-with-mobile-devices/blob/master/push-notify/Network/PushNotify/Gcm/Types.hs#L43-L49