Add back bin/zerorpc, now a tiny wrapper.

This small wrapper is here when you want to run zerorpc without
installing it, for some testing or any specific development
environment.
Update README.rst

minor spelling and continuity corrections
Merge pull request #55 from aelse/patch-1

Update README.rst
Follow updates on pyzmq 13.0.0

 - XREP/XREQ constants are now definitively replaced by ROUTER/DEALER.
 - Some weird getattr/setattr magic were added to pyzmq, which makes
   inheriting from pyzmq classes annoyingly frustrating, especially:
	- zmq.Context: solved by defined attributes wiht None, at the class
	  level.
	- zmq.Socket: solved by using self.__dict__ directly.
update test, to help reproduce bug in travis

It seems that Travis has something special that makes some test crash
pretty bad. Its really hard if not impossible to reproduce, for now I
extended the heartbeat frequency of the tests to 2 seconds (to be longer
than the maximum wait on the (py)ZMQ bug of missing events). I also used
a gevent.Pool to forward exceptions.
"Less ugly" fix for context.py and clarify comments about pyzmq 13.0.0
Merge pull request #59 from lopter/master

"Less ugly" pyzmq 13.0.0 fix for context.py and better comments about the issue
Revert "Making the first server/client sample work with pyzmq-13"

This reverts commit 1bd8c1f9a45803e1a5ad933622294672e9f84be2.
Merge remote-tracking branch 'dotcloud/master'

* dotcloud/master:
  "Less ugly" fix for context.py and clarify comments about pyzmq 13.0.0
  update test, to help reproduce bug in travis
  Follow updates on pyzmq 13.0.0
  Update README.rst
  Add back bin/zerorpc, now a tiny wrapper.
version bump