update to use --name, and add a little more detail to how docker start -a works



thought it works a little awkwardly:

```
docker@boot2docker:~/.ssh$ docker ps
CONTAINER ID        IMAGE               COMMAND                CREATED             STATUS              PORTS
                                      NAMES
dd8b387114d6        ubuntu:12.04        /bin/sh -c while tru   3 seconds ago       Up 3 seconds
                                      moba
41d000f53e12        samba:latest        bash                   4 days ago          Up 19 hours         0.0.0.0
:139->139/tcp, 0.0.0.0:445->445/tcp   trusting_ritchie
docker@boot2docker:~/.ssh$ docker start -a moba
Error: start: Cannot start container moba: The container dd8b387114d62c71c8144e2701171e64e41d4d9f3666203e36d8d
5b3cf8a3cb0 is already running.
hello world
hello world
hello world
hello world
hello world
hello world
hello world
hello world
hello world
hello world
♥2014/03/03 21:35:06 Error: failed to start one or more containers
docker@boot2docker:~/.ssh$
docker@boot2docker:~/.ssh$
docker@boot2docker:~/.ssh$ docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS
                                   NAMES
41d000f53e12        samba:latest        bash                4 days ago          Up 19 hours         0.0.0.0:13
9->139/tcp, 0.0.0.0:445->445/tcp   trusting_ritchie
docker@boot2docker:~/.ssh$ docker start -a moba
moba
hello world
hello world
♥docker@boot2docker:~/.ssh$
```