Let request handler access connection id trough special header
Let request handler access connection id trough special header INTERNAL_REQUEST_ID

INTERNAL_REQUEST_ID metaheader is now allows one to get access to
connection data from request handler
Merge branch 'master' of https://github.com/mxpaul/AnyEvent-HTTP-Server-II
Introduce abort() in Req.pm - does not work yet
Make $req->abort work with no nginx in the middle
Merge pull request #1 from mxpaul/master

Connection id in INTERNAL_REQUEST_ID header and abort() in Req.pm