py cache + PIE bugfixes, scan faster
- important python cache bugfix (PR #121)
- Python 2 and 3 Unicode conversion bugfix (PR #121)
- important PIE bugfix (PR #124)
- gui: Export DISPLAY and XAUTHORITY (Ubuntu 14.04 with MATE bugfix)
- scan performance optimization: -38% time if all matches, -13% time if nothing matches, -21% time if all and then nothing matches
- some clean-ups
- known issues: #140, #141, #142, 64d5e76 - apply patches on top