Add keep-alive and timeout options (thanks @rexxar) #125
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When implementing keep-alive support I just pulled in the work from @Rexxar on timeouts as i slightly refactored it to handle timeout events that could possibly happen after connect (which I have not seen but was going for the side of safety). @squaremo let me know your thoughts as I think having keep-alive support is a nice complement to the heartbeat functionality you have implemented.