PROTON-260 : improved description of windowing


git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/trunk@1479686 13f79535-47bb-0310-9956-ffa450edef68
initial commit of a simple library for basic data structures; this includes an API for ref countable objects, lists, maps, hashes, and strings

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/trunk@1479696 13f79535-47bb-0310-9956-ffa450edef68