WIP - Add Debian init script

Hi,

this adds a Debian init.d script. In its current state in it's only useful for *real* Debian distros.
Also it has some customizations like bouncing the version and a hardcoded `$GOPATH`, because I couldn't get it to build on `Squeeze` otherwise.
In order to support Ubuntu, we would have to add an upstart script conditionally instead of the systemv one.