remove attempt at bond support from pry and move to `pry-bond` project.

https://github.com/johnny5-/pry-bond project adds the enable-bond! and disable-bond! commands,
as well as other features, that enhance the pry&bond experience and make it easier to use and
setup without a manual effort.

see #1165
closes #1160
update CHANGELOG.md
Merge pull request #1166 from pry/move-bond

remove attempt at bond support from pry and move to `pry-bond` project.