Adding code to concatenate duplicated response headers in comma delimited list. (#123)
Adding code to concatenate duplicated response headers in comma delimited list. (#123)

- This respects rfc2616 spec.
lubeltra/libHttpClient,jasonsandlin/libHttpClient,jasonsandlin/libHttpClient,jasonsandlin/libHttpClient,lubeltra/libHttpClient,lubeltra/libHttpClient,jasonsandlin/libHttpClient,jasonsandlin/libHttpClient,lubeltra/libHttpClient,lubeltra/libHttpClient