Added Micro Service presentation

[kyleboon]

This presentation about designing and building micro services is fantastic. One of the best explanations I've come across.

[mmcgrana]

This is an interesting presentation, thanks for suggesting the link.

I've decided not to include it the list for now though, because I'm not sure that the ideas are generally applicable enough to the space I'm trying to cover. I'll keep an eye on the microservices idea though and see if it pops up again.