v0.7.8

• Adds a global and per-task cached option, which will redirect any results to the much faster cache backend where it is accessible for all the result functions without touching the database.
• Adds a count option for groups results which will block until the indicated amount of results in the group has been reached
• Adds a wait option in miliseconds for group results. Can be used in conjunction with count
• Adds async_iter(func, args_iter, **kwargs) command which takes an iterable set of arguments, asyncs them individually against the cache backend and collates them back into a single database result.