We're MIT.
Centralize all the subsystems in flambe.subsystem.

Big change, but it's mostly internal since users generally never
explicitly import these classes. Having them all in one place makes
grokking Flambe's capabilities easier, I think.

Reducing the number of one-class packages is also a motivation here.

Refs #97.
Imports tidying.
Extract flambe.server out into its own lib.

It lives at https://github.com/aduros/flambe-server now.

I suspect Everybody Runs is the only project that uses it. It's not
really maintained at the moment, and was a bit out of place with the
rest of Flambe core.

I have a bunch of application-server type stuff written for ER that I
might clean up and move over to that project someday.