Added --autoloader/-a option to fresque start command

Hey,

Great project. I noticed the start option did not have any ability to override the include option in the config file so I added it to the cli. Please review and let me know what you think.

Also, as a side issue, I don't see any way one can pass custom variables onto fresque. For instance, I may want to setup a particular environment for a given queue; Thoughts on possible implementation would be appreciated. I may whip something up in my free time.

Regards