Remove obsolete BodyDelegator
Bump up YARDStick threshold
Make HTTP::Headers Enumerable

Closes https://github.com/tarcieri/http/issues/105.
Do not override user specified Host header
Merge pull request #106 from tarcieri/refacor/dont-enforce-host-header

Do not override user specified Host header
Add Headers#empty?

Closes #107
foo
Merge branch 'master' into caching