Add the ability to set a optional timeout

[robhenley]

@cristiangrama Thanks for reviewing. Why create a class constant and then assign it the class property timeout instead of just setting a default value to the timeout class property?

[cristiangrama]

That is just for readability. You could have it on the property too but I feel that using a constant is more readable. Any of them would work.

const DEFAULT_TIMEOUT = 30;

private $timeout = self::DEFAULT_TIMEOUT;

vs

private $timeout = 30;

[robhenley]

Thanks for explaining. I didn't see constants used elsewhere so was curious why. Updates have been made.