wip
Implement streaming of body.
Oops.
Move streaming to a middleware.
Add support for `use` and `map` in thin conf file.
Move middlewares to root dir.
Fix requires and unit tests.
Make configurator wrap app w/ Thin's middlewares.
Fix FastEnumerator under 1.8.
Make sure Body#close is called.
Add some doc RE streaming.
Simplify Connection.
Move middlewares to middlewares/
Fix close.
wip
wip
Some renaming.
No RE use of Fibers in Streamed middleware.