--version checks latest version

![image](https://cloud.githubusercontent.com/assets/756988/5470779/53d2501a-8630-11e4-82a0-c7b8bef19354.png)

Sadly it takes about 1sec to get http response :/

https://github.com/google/stagehand/issues/81

Perhaps, pull this string out into a constant (like APP_NAME)?