Bayesian Optimization and Gaussian Processes

[tbreloff]

I'm sitting here with @bisraelsen at NIPS, and discussing the need for good Bayesian Optimization and Gaussian Processes. Some quick thoughts:

• wrap GPFlow python lib
• use/extend GaussianProcesses.jl
• use BayesOpt.jl (does it need updating?)

I'm just putting this issue out there so we don't forget about the conversation! Anyone with interest/thoughts, please post here.

cc: @nowozin