futures

In this month's meetup, we'll be learning about futures (0.1).
The aim of the session is to get people who aren't familiar with futures up-to-speed, and to help users of futures deal with the common pain points.

We are going to:

- try out various futures combinators (map, for_each, filter_map, then, and_then, etc)
- create our own futures from the Futures trait
- deal with function return signatures (impl Future, or do we Box?)

The aim is to deal with streams in detail, and futures 0.3 in separate sessions later on.

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18h is informal greetings, pizza, and drinks. This is followed by a talk/demo, complete with questions and discussions. 20h is when we vacate the nice offices of Jemstep.