Merge pull request #6 from markreidvfx/master

Fix for avresample and to get travis working again
Install av package as well

Otherwise only the .so files were installed and not __init__.py
Merge pull request #7 from jerdfelt/master

Flag av package for installation
Notes
Docs on GitHub pages
make samples
Clean up TODO.txt; start HACKING.txt
added seek module from seek branch