text: Title: Update hyper-parameter example notebook
  Body: Now that we have `BayesSearchCV` we should update/cross link the bayes search CV example notebook and then hyper-parameter optimisation one.
  
  As part of this we should also change the name of the searchcv notebook so it renders more like the others on our webpage:
  
  <img width="243" alt="screen shot 2017-07-10 at 09 06 02" src="https://user-images.githubusercontent.com/1448859/28006330-15ac551e-654f-11e7-9c5b-7ddef051fb37.png">
  