fix bug where Node.js incomingHttp streams would not read correctly

fix bug where under Node.js would sometimes continue to read from str…

…eam after aborting

.source property available on oboe instance to give either the url or…

… stream being read from

simplify code slightly

fix issue #38 - node can open http or https streams for the user

fixes issue #37 - do not include X-Requested-With by default with CORS

fix issue #39 where query params were dropped running under node

fix bug where parsing invalid json would sometimes behave differently…

… depending where the stream breaks up the content

no argument called arguments - compat with Closure compiler

various optimisations