Removing version requirements for php-resque
Adding database and prefix selection, to be compatible with php-resque.
Fixing zrangebyscore.
Removing unneeded fix in last commit.
Revert "Removing unneeded fix in last commit."

This reverts commit 37ea2e2a545af6e312986638480998ef7d848d61.
Merge pull request #20 from JaapRood/master

Make master of scheduler compatible with current master of php-resque