Small change to allow failover incase a remote turns out to be unavailable

[michaelneale]

I modified client_connection.rb to look at the result returned from the connect_error_callback - if true is returned - it will then start the connection process again - calling the connection block again. This means that a different backend (remote) can be given - and the client is none the wiser (not unlike what haproxy does).

There is also a load_balancer.rb which shows this in action. I also threw in that some randomiser-based weighted load balancing (something I am doing) - I tried randomising as it means that I don't have to have any shared state regardless of how many proxymachines I have running (of course I could count connections - but some other changes needed).

There may also be pictures of my dog, can't remember what else I included.

Would love any thoughts/feedback (I have a few alternative approaches I would like to try).

[lstoll]

@michaelneale would you mind rebasing against master?

[michaelneale]

@lstoll I will get right on that.

types into invisible typewriter