To start an apiserver:
```
apiServer := APIServer{Path: "/path/to/my/apiserver/binary"}
session, err := apiServer.Start("tcp://whereever.is.my.etcd:port")
Expect(err).NotTo(HaveOccurred())
```
When you're done testing against that apiserver:
```
session.Terminate().Wait()
```
...or if you prefer:
```
gexec.Terminate()
```
...which will terminate not only this apiserver, but also all other
command sessions you started in this test.
Gareth Smith