Improved install instructions (#85)
Improved install instructions (#85)

I recently tried to run OWAPI on a completely fresh ubuntu vm and ran into some problems. They were easy enough to fix with some basic troubleshooting, but should be covered by the install instructions.

The 4 changes I made:

* install xlib1g-dev with apt
* install wheel with pip (apparently a prerequisite to build some of the pip packages)
* activate the virtual environment with `./venv/bin/activate` instead of `./venv/activate`.
* mention that the server is running on port 4444, not 80 like the official server
SunDwarf/OWAPI,azah/OWAPI