Merge pull request #223 from vincenthz/master

upgrade warp-tls to tls 1.2
Version bump
tls version bump
Bump lifted-base dep (fixes #224)
merged http-attoparsec (byte ranges parser) package and replaced dependency to it with attoparsec
Fix warp.cabal
Added some parseByteRanges tests
Version bump
Drop attoparsec dep
settingsNoParsePath
Only send 500 responses on exceptions when safe

In particular:

If the user has already sent (at least) the beginning of a request, and
the response has not yet started.
Disable some exception tests
Version bump
implementing settingsOnExceptionResponse for #218.
trial for travis-CI.
trial to fix travis CI.
trial to fix travis CI.
one more try to fix travis-CI.
new settingsOnOpen for access control.
Add client socket address information to settingsOnClose.