Add warnings about prepared statements on Rails v4.0.0-4.0.3
Add warnings about prepared statements on Rails v4.0.0-4.0.3

rmoorman/heroku-buildpack-pgbouncer,heroku/heroku-buildpack-pgbouncer,BetterWorks/heroku-buildpack-pgbouncer,realtymaps/heroku-buildpack-pgbouncer,Shyp/heroku-buildpack-pgbouncer,Yobota/heroku-buildpack-pgbouncer,agriffis/heroku-buildpack-pgbouncer