Overly strict dependency on gevent==1.1.1

[tysonclugg]

The dependency on gevent==1.1.1 is overly strict, it should be relaxed to allow for newer versions of gevent as well (gevent>=1.1.1). The current version of gevent is 1.1.2.

The strict dependency is in https://github.com/locustio/locust/blob/master/setup.py#L43 and was introduced in commit 1a2c9da in response to issue #421, where OSX was having trouble, presumably due to bugs in the beta release of gevent available at the time. I can't think of any reason why the version should be pinned to prevent installation of the current version of gevent.

[jbwhaley]

Having this issue on CentOS 7.2 as well. Agree that pip install probably shouldn't break every time gevent is updated.

[heyman]

This is changed in master where we specify gevent>=1.1.2.

The latest master has been released to PyPI as a pre-release, and can be installed with:

pip install locustio==0.8a1