Fix ActiveRecord connect/disconect
Exit explicitly when running un-spring rails commands

Prevents "warning: already initialized constant APP_PATH" and
potentially other code from running that you don't expect to run.

Fixes #259.
Don't cache classes unless the environment permits it

Fixes #264.
Merge pull request #257 from fred/hotfix/256-active-record-fix

Fix ActiveRecord connect/disconect
Add changelog, tweak patch
Add some retries

Getting a lot of connection errors on the CI and it's annoying.
Swallow errors in stop
Bump to 1.1.2