Add ability to set timeout for reservations

[kamazan]

Hi,

Related to #8.
I added an option into for worker:run commands to be able to set the timeout value and possibly wait forever for a job.

[pkruithof]

I don't think this works the way you expect it to, see https://github.com/pda/pheanstalk/blob/master/src/PheanstalkInterface.php#L219-L222:

• A timeout value of 0 will cause the server to immediately return either a
• response or TIMED_OUT. A positive value of timeout will limit the amount of
• time the client will block on the reserve request until a job becomes
• available.

it seems that a response would be immediately returned, instead of (potentially) waiting forever.

[kamazan]

It's not documented at all in the pheanstalk library but the Pheanstalk instance runs forever when a timeout below 0 is given.

[pkruithof]

Thanks!