[MRG] Improve hyperparameter optimisation objective notebook (#257)
[MRG] Improve hyperparameter optimisation objective notebook (#257)

* Improve hyperparameter optimisation objective notebook

* Remove n_random_starts setting

* Fix plot sizes and some comments

* Update example

* Update notebook

* typo

* remove introduction

ccauet/scikit-optimize,scikit-optimize/scikit-optimize,betatim/BlackBox,betatim/BlackBox,scikit-optimize/scikit-optimize