Update build requirements and documentation
Reorganized dependencies in DEPENDS.txt.
Fix install_requires string formatting
Fix python 3 unicode error
Remove unicode decode
Fix python3.3+ builds
Look for  version instead of  version
Add description for networkx optional requirment
Make matplotlib a requirement.
Fix travis syntax errors
Fix another travis syntax error
Move matplotlib to a runtime requirement
Remove redundant 'usage requirements'
Replace PIL with matplotlib in build_versions.py
Fix typo in travis preventing mpl 1.0 from installing
Install matplotlib build dependencies
Fix matplotlib base version and install libjpeg-dev
Install libjpeg-dev, not build-dep libjpeg-dev
Try explicit apt installs for matplotlib
Allow for unicode version info