Update README.md

rpush.yml no longer is generated; update to reflect rpush.rb
Merge pull request #51 from joshmn/patch-1

Update README.md
Adds ActiveRecord::ConnectionTimeoutError to the list of handled exceptions on Reconnectable
Merge pull request #53 from jmnsf/fix_active_record_timeout_resend

Handles DB timeout in reconnectable.rb
Rename Apns::Feedback#app to app_id, change type to Integer. Fixes #50.
Fix integer devision error. Fixes #57, #56.
Add example Upstart job.