headers: add Delivered-To check
karma: 2 changes:

* apply awards before adding message header (so the Header value has data_post
  awards shown)
* permit karma to rejecting during queue hook
Merge pull request #728 from msimerson/headers

headers: add Delivered-To check
Merge pull request #729 from msimerson/karma

karma: 2 changes:
initial HTTP support (not cluster happy, yet)