Commit failing test for https://github.com/snapframework/snap-core/issues/192
Fix bug with HEAD requests and chunked transfer-encoding.

Closes https://github.com/snapframework/snap-core/issues/192
Allow new attoparsec. Releasing as 0.9.4.5.
Merge commit '5f4bf57a9fa2b32ccf3299c672b59f368a723b47'

NOTE: we have a failing test (blackbox/chunkedHead), this was fixed on the 0.9
branch but the fix needs to be backported.

Conflicts:
	snap-server.cabal
	src/Snap/Internal/Http/Server.hs
	test/Test/Blackbox.hs
	test/Test/Common/TestHandler.hs
	test/snap-server-testsuite.cabal
	test/suite/Snap/Internal/Http/Server/Tests.hs
Allow new attoparsec
Merge branch '0.9-stable'