Added Best Guess Tracking to expdesign
Added Best Guess Tracking to expdesign

An optional flag has been added to store the best guess, and guess
quality, made in a group of experiments.  The code now outputs the best
guess seen so far.  This allows iterating over different guesses to be
straight forwardly implemented in test code.

QInfer/python-qinfer,ihincks/python-qinfer,whitewhim2718/python-qinfer,Alan-Robertson/python-qinfer,csferrie/python-qinfer,MichalKononenko/python-qinfer