Added #description to look_like matcher
Added #description to look_like matcher

 - In order to specify:

it { should look_like ok_response }

   the "look_like" matcher must have a description.

 - Since the look_like matcher aggregates other matchers, we save the
   last_matcher and last_should, and restore them at the end of matching
   code.

chef/chef-pedant,chef/chef-pedant,chef/chef-pedant