Changes to support redis AUTH
Modified the PostTask function in Celery class to support eta.

Added support for additional arguments to be passed to task such as eta.
$task_args may contain additional arguments such as eta which are useful in task execution 
The usecase of this field is as follows:
$task_args = array( 'eta' => "2014-12-02T16:00:00" );
Merge branch 'lankesh-master'
Added an example for connecting to Redis with password
Merge branch 'master' of github.com:gjedeer/celery-php

Conflicts:
	redisconnector.php