GSoC results

Version bump.

Update changelog. Move to lsof for transparent OSX is not working on …

…Mountain Lion.

Make ready for pyinstaller.

Make pypi render our perfectly valid RST description.

Final prep for 0.7.

Update trove classiviers in setup.py

Prep for 0.5 release

- Update CHANGELOG and CONTRIBUTORS
- Bump version
- Include Apple Gamecenter highscore setting tutorial in docs

Spell-check docs, setup.py fixes, add missing files to manifest.