Handle another error in HostCommander

I recently experienced an error shown in the following snippet of the trace:

```
[2013-08-22T23:42:39Z] PID[11301] TID[ieu44] ERROR: Ridley::HostCommander crashed!
Errno::ETIMEDOUT: Connection timed out - connect(2)
	/opt/rbenv/versions/1.9.3-p327/lib/ruby/gems/1.9.1/gems/celluloid-io-0.14.1/lib/celluloid/io/tcp_socket.rb:85:in `connect_nonblock'
	/opt/rbenv/versions/1.9.3-p327/lib/ruby/gems/1.9.1/gems/celluloid-io-0.14.1/lib/celluloid/io/tcp_socket.rb:85:in `initialize'
	/opt/rbenv/versions/1.9.3-p327/lib/ruby/gems/1.9.1/gems/ridley-1.3.2/lib/ridley/host_commander.rb:213:in `new'
	/opt/rbenv/versions/1.9.3-p327/lib/ruby/gems/1.9.1/gems/ridley-1.3.2/lib/ridley/host_commander.rb:213:in `block (2 levels) in connector_port_open?'
```

I realize this is an older version of Ridley, but the lines in question have not changed between these releases. According to the docs for the [Socket class](http://www.ruby-doc.org/stdlib-1.9.3/libdoc/socket/rdoc/Socket.html) `Errno::ETIMEDOUT` can be thrown, so we should attempt to handle it.

Also, I ended up with some test failures, because I hadn't executed `bundle update` in a while, and at some point code was added that was rspec 3.14.X specific. I think it makes sense to attempt to nail down a specific version of rspec and increase it as necessary.