Make docs/messenger dir, put docs in it, use
an extension for markdown files that is less 
verbose, loquacious, and wordy.


git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/trunk@1455907 13f79535-47bb-0310-9956-ffa450edef68
removed dead remnants of accept-mode

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/trunk@1455926 13f79535-47bb-0310-9956-ffa450edef68