Make CLI to manually send Gearman requests

[CianLR]

This should make it easier to test and demo our project. We can use it to send requests to the workers to do things such as kicking off a manual aggregation.

[devoxel]

What kind of cli do you think works best?

Like an interactive one with menus, or a static type one?

[CianLR]

I'm thinking of something nice, with a menu and stuff. I'd like to make it extensible too, so we can change the params sent to workers or add new workers quite easily