WIP
a-ha! returning a promise-like thing makes this much nicer
oh right... let a few anonymous function expressions sneak in
make AsyncSequence#reduce public
implemented AsyncSequence#find

Some of this is getting pretty messy, docs-wise (as in, I'm not
doing a good job documenting my progress as I go). I am aware of
this but writing code is just where my brain is right now. I
sincerely hope that tomorrow morning I'll be in more of a "Let's
update the API docs!" sort of mood.
made AsyncSequence#async return the same sequence (why not?)
fixed spec for AsyncSequence#async
added support for reverse async iteration
refactoring project site using Middleman
fixed jquery.treetable version
that about partial was useless