Responds to events and starts the build process
          different implementations can decide on what methods they will accept

        :arguments:
            request
                the http request object

def render_POST(self, request):
        """
        Responds to events and starts the build process
          different implementations can decide on what methods they will accept

        :arguments:
            request
                the http request object
        """
        try:
            d = self.getAndSubmitChanges(request)
        except Exception:
            d = defer.fail()

        def ok(_):
            request.setResponseCode(202)
            request.finish()

        def err(why):
            code = 500
            if why.check(ValueError):
                code = 400
                msg = unicode2bytes(why.getErrorMessage())
            else:
                log.err(why, "adding changes from web hook")
                msg = b'Error processing changes.'
            request.setResponseCode(code, msg)
            request.write(msg)
            request.finish()

        d.addCallbacks(ok, err)

        return server.NOT_DONE_YET