Introduce config.set_proc_title
Created by: mrkn
config.set_proc_title
is a setting to enable a feature of example to set the
title of process of rspec to be the current example location.
If config.set_proc_title set to true, the process title is set to the current example location and the full description of the example.
If config.set_proc_title set to :simple
, the process title is set to the
current example location.