Axon

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* add default random `identity`
* add `req.send()` callback support
* remove router / dealer
* change `ReqSocket` to round-robin send()s

==================

* add router socket [gjohnson]
* add dealer socket [gjohnson]
* add req socket [gjohnson]
* add rep socket [gjohnson]
* add multipart support [gjohnson]
* add `.set()` / `.get()` configuration methods
* add tcp://hostname:port support to .bind() and .connect(). Closes 16
* add `make bm`
* add Batchempty()
* remove Socketoption()

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* add resize example
* add `debug()` instrumentation
* add `PullSocket` bind support
* add `Parser`