corrected removal of travis key
Merge pull request #301 from heroku/travis-remove-key

corrected removal of travis key
better cedar-14 ruby install error message

Show full stack trace on all unexpected errors
Keep same error interface

Only suppress backtrace from likely errors
travis, again
Merge pull request #309 from heroku/schneems/better-ruby-version-error

better cedar-14 ruby install error message
bump to v128
v128 changelog
Merge branch 'master' of git://github.com/heroku/heroku-buildpack-ruby
Merge branch 'master' of github.com:AnyPresence/heroku-buildpack-ruby into upgrade