Event library for handling events for eidos

From http://docs.python-requests.org/en/latest/user/install/?highlight=gevent

If you are using the requests.async module for making concurrent requests, you need to install gevent.

For OSX and Ubuntu, to install gevent, you’ll need libevent.

OSX:

$ brew install libevent

Ubuntu:

$ apt-get install libevent-dev

Once you have libevent, you can install gevent with pip:

$ pip install gevent

For Windows, you don't need libevent, but you would need to use installer for the libraries. You can find both the gevent library library from http://www.lfd.uci.edu/~gohlke/pythonlibs/. Install them and copy the library over into virtual environment