Revert "needs to bundle rdoc gem for Ruby 1.8"
Revert "needs to bundle rdoc gem for Ruby 1.8"

This reverts commit 56222826fbfc09a908a76937bd67d0f1d0d1fa55.

Reason: Ruby 🔞

amatsuda/kaminari,kaminari/kaminari,amatsuda/kaminari,kaminari/kaminari