This should include Timeout::Error for 1.8.7 compatibility.

```
rescue StandardError,Timeout::Error => se
```

http://martinciu.com/2010/12/ruby-timeout-error-is-not-a-standard-error.html
```
Starting: Fri Mar 21 06:07:31 -0700 2014
/usr/lib/ruby/1.8/timeout.rb:64:in `open': execution expired (Timeout::Error)
  from /usr/lib/ruby/1.8/net/http.rb:560:in `connect'
  from /usr/lib/ruby/1.8/net/http.rb:560:in `connect'
  from /usr/lib/ruby/1.8/net/http.rb:553:in `do_start'
  from /usr/lib/ruby/1.8/net/http.rb:542:in `start'
  from /usr/lib/ruby/1.8/net/http.rb:1035:in `request'
  from /usr/lib/ruby/1.8/net/http.rb:772:in `get'
  from /tmp/gce.rb:7:in `server_available?'
  from /tmp/gce.rb:16
```