Use goforever instead of supervisor

[HelloGrayson]

Supervisor is terrible.

RUN apt-get -y install golang
RUN mkdir /go
RUN export GOPATH=/go && export PATH=/go/bin:$PATH
RUN go get github.com/gwoo/goforever
ADD mesos-slave.tml /mesos-slave.tml

[inthecloud247]

why not runit?