Added Pheanstalk prefix in psr-0 to improve autoloading performance.
Added Pheanstalk prefix in psr-0 to improve autoloading performance.

dcb9/pheanstalk,lcwxz1989/pheanstalk,Pasarkode/pheanstalk,jbboehr/pheanstalk,augustash/pheanstalk,jhammer/pheanstalk,pda/pheanstalk