update example php project bootstrapping
update example php project bootstrapping

Don't install another copy of composer, but simply symlink to the
composer.phar file in the concourse-driver-php project

vrnithinkumar/concourse,hcuffy/concourse,JerJohn15/concourse,kylycht/concourse,kylycht/concourse,cinchapi/concourse,hcuffy/concourse,JerJohn15/concourse,remiemalik/concourse,cinchapi/concourse,vrnithinkumar/concourse,remiemalik/concourse,cinchapi/concourse,JerJohn15/concourse,remiemalik/concourse,kylycht/concourse,hcuffy/concourse,hcuffy/concourse,dubex/concourse,dubex/concourse,remiemalik/concourse,vrnithinkumar/concourse,JerJohn15/concourse,kylycht/concourse,cinchapi/concourse,dubex/concourse,dubex/concourse,dubex/concourse,JerJohn15/concourse,cinchapi/concourse,vrnithinkumar/concourse,hcuffy/concourse,hcuffy/concourse,kylycht/concourse,vrnithinkumar/concourse,dubex/concourse,remiemalik/concourse,kylycht/concourse,JerJohn15/concourse,remiemalik/concourse,cinchapi/concourse,vrnithinkumar/concourse