Do not use debugger in 2.0.0

And move pry-* and debugger to dev and test env
Remove travis condition
Revert "Remove travis condition"

This reverts commit 51725473c72647a5001879e4aa2672f792970948.
Merge remote-tracking branch 'origin/master' into feature/debugger-travis
Do not use --deployment option in travis bundler
Merge pull request #43 from sanemat/feature/debugger-travis

Do not use debugger in 2.0.0