Revert "Use English name equivalents for Ruby's special variables"

This reverts commit e0fd73c5e1e2e8a2968f8b85f9cc30f17a93aa63.
Revert "Avoid using %r since we have less than once '/'"

This reverts commit 320e0447c8bbb40d34e3543d384f93b34c325e97.
Better way of solving the rubocop gemspec problem

Addresses issue #16