Remove pry-debugger dependency so people can choose their debugger
Update for Pry 0.10.1 and Byebug.

- debugger gem is incompatible with Ruby 2.x
- pry 0.9 is outdated
- Changed debugger dependency to byebug-pry
- Updated pry 0.9 dependency to 0.10.1.
Update CHANGELOG.md
Merge branch 'byebug_and_updated_pry' of github.com:jkrmr/jazz_hands