Remove raw terminal option

@fsouza you suggested that you thought this code was worth removing, so I thought I'd submit a PR for it

i'm very new to go and got a new machine since I last ran the go-dockerclient tests, so I can't remember how to. any pointers for me so that I can be sure this code is alright before you try merging it?

    $ go test
    misc.go:9:2: cannot find package "github.com/fsouza/go-dockerclient/engine" in any of:
    	/home/bmccann/.gvm/gos/go1.2/src/pkg/github.com/fsouza/go-dockerclient/engine (from $GOROOT)
    	/home/bmccann/.gvm/pkgsets/go1.2/global/src/github.com/fsouza/go-dockerclient/engine (from $GOPATH)
    client.go:15:2: cannot find package "github.com/fsouza/go-dockerclient/utils" in any of:
    	/home/bmccann/.gvm/gos/go1.2/src/pkg/github.com/fsouza/go-dockerclient/utils (from $GOROOT)
    	/home/bmccann/.gvm/pkgsets/go1.2/global/src/github.com/fsouza/go-dockerclient/utils (from $GOPATH)

    $ godep go test
    godep: No Godeps found (or in any parent directory)