Merge pull request #70 from medvedobijec/master

Update to less 2.4.0
Fix minitest deprecation.
Partial revert of #70. Move back to 2.3 less.rb.
Revert "Partial revert of #70. Move back to 2.3 less.rb."

This reverts commit 0ebd448e49522d48e1b4cd1fde3f5d476d46154b.
Moving to less.rb 2.4.x which is current v1.4.2 of less.