release 0.0.4
fixed dependency to request module
increased version number
pub/sub handlers are wrapped in domain objects for hardening
subscribing: replaced error 405 with 400 and added error 500 on repeated subscription (same event, same subscriber url and same method)
Merge branch 'no-repeated-subscriptions' into develop
increased version number
added info to README regarding zeromq
progressing Zeromq API
added learning test for integration of zeromq
added zmq XPUB/XSUB proxy; big refactoring: separated REST and zmq stuff into their own modules
Merge branch 'with-zero-mq' into develop

Conflicts:
	README.md
	package.json
	test/testSubscribing.js