Fix requirements py26
Fix dependencies to work with python 2.6
- gevent >= 1.2 needs python >= 2.7
- numpy >= 1.12 needs python >= 2.7
Once we have conda packages we may drop python 2.6 completely but for now we have to do it
Fix dependencies to work with python 2.6
Once we have conda packages we may drop python 2.6 completely but for now we have to do it