Added Centos7 Installation

[raspher]

Just described the installation in centos7, should all work.

I had a mistake, installed python34 instead of python34-devel while describing (repaired that), but all should work 👍

[ivan]

Thanks for testing this. I think you meant virtualenv, not pyenv. pyenv compiles Pythons from source. If you would like this merged:

s/Centos/CentOS/

I have everyone use a virtualenv in ~/gs-venv so that I can provide consistent usage and upgrade instructions and easier support. Hopefully that's available in CentOS and can be used here?

Don't sudo pip3.4 install, there is no need to run things as root, especially less-trusted Python dependency install scripts.