Avoid crashing in cowboy_req on invalid Accept-Encoding header

Certain clients send malformed Accept-Encoding headers, which causes
cowboy_req to crash is compression is enabled.
Merge branch 'fix/crash-on-invalid-accept-encoding' of git://github.com/soundrop/cowboy
Update erlang.mk
Add support for the webkit deflate frame extension
Merge branch 'feature/websocket-deflate-frame' of git://github.com/soundrop/cowboy
Update Ranch to 0.8.4
Add asn1 to the list of applications to be started for SSL

Required since R16B01. And apparently needed in some cases before.
Ignore deprecation warning for crypto:sha/1 for now

We can change this call when we start supporting only R16B+,
which may happen when R17B is released or some time before.
Update AUTHORS
Update CHANGELOG
Update to 0.8.6
Fix compilation < R16B01
handle multipart requests with chunked encoding
wait for the last chunk before declaring we are done.