Merge pull request #87 from thnkr/master

schedule -> Fix to rubocop error.
Evolution of metrics
Adding some docs
Added a test and some docs
Added some more docs. Fixed some typos and fixed the options passing to values method on attribute
Fixed rubocop issues
Merge pull request #86 from fluke777/master

New features for changing the metrics
Removing binding.pry
Merge pull request #89 from fluke777/master

Removing binding.pry
 Rubocop session