Add matplotlib to Pip requirements
Mock matplotlib from Sphinx builds

Allow the Sphinx documentation to build even it matplotlib is not
installed.
Fix up setup so that it installs right
Merge branch 'fix-setup-py' of https://github.com/hawkowl/wordgraph into hawkowl-fix-setup-py

Conflicts:
	wordgraph/__init__.py
Merge branch 'hawkowl-fix-setup-py'
Merge branch 'master' of https://github.com/tleeuwenburg/wordgraph
Add visual example with Wordgraph output

Use the server requests test to compare the visual graph with visual
description in documentation.
Add a Vagrant file: sets up a VM with all dependencies for working with
python3.

re: #6