JavaScript binding now pretty much in a releasable state. Needs a little bit of tidying up, a few more tests and examples, but it now has a more or less complete implementation of qpid-config to test interoperability with C++ Maps and Lists. Proton-c compiles cleanly now using emscripten as I have made all the necessary changes to emscripten itself, so all the Proton JavaScript code is what might be considered a wrapper around proton-c, it is very similar indeed to the Python binding. Needs some performance tests added and profiling, but it functionally covers pretty much all of Messenger, Message and Codec

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/branches/fadams-javascript-binding@1616550 13f79535-47bb-0310-9956-ffa450edef68