Task submission by string?

[waldner]

Currently, the delay() function accepts a function name (eg tiger.delay(tasks.my_task, ...)), which means that the submitter must have visibility into the worker code. Other task queue systems allow submitting tasks by passing a string representing the function to call, eg

tiger.delay('tasks.my_task', ...)

this decouples the submitter from the worker. Is something like this possible with tasktiger?