Updated poms to add http-delegation dependency and build Java sources
Added DateUtils library from Apache's HttpClient
Updated CheckerServletRequest to allow header mutation
Implemented a delegation handler
Merge pull request #231 from rackerlabs/delegation

Add support for Delegation Handler
Exhaustive coverage for getHeader pattern match
Merge pull request #232 from rackerlabs/delegation

Exhaustive coverage for getHeader pattern match
Prep for release.
Merge pull request #233 from RackerWilliams/release_prep

Prep for release
Updated to use Log4J 2.x and explicitly called out the SLF4J versions so they are all the same as Repose.