Add HTTP::Tiny interface for LWP replacement in tests
simplify the code using Hash::MultiValue
force LWP client in chunked tests
remove unused code
Only send content when there really is a content.
bump META for Travis
rename module. Refer to HTTP::Thin for the use outside Plack
Merge pull request #410 from plack/http-tiny-lwp

Add HTTP::Tiny interface for LWP replacement in tests