removed autoinstall of libzmq

fixes issue #25
updated README as per #24

Added mentions of:
*  collectstatic for production django server
*  apt-get install build-essentials before running setup.py
*  zmq not installed with apt before running setup.py
Implemented passthrough for ZMQ communication

between Django and Flask.  Currently, this passthrough
runs as a separate process, but the plan is to integrate
it with the Flask app as a gevent task.
integrated zmq passthrough with gevent

the passthrough can now be spawned from the flask process
enabled multiple django workers in supervisor config file for django
Merge pull request #27 from kkleidal/issues24_25

Fixes Issues #24 and #25
Merge pull request #33 from kkleidal/issue19_2

ZMQ Flow Change to Allow for Multiple Django Workers
Merge #35 from @kkleidal
adds catch for when we get a string instead of an expected numeric value
Merge remote-tracking branch 'upstream/master' into rfid5