0.12.0 released

• Python 3 support, but Python 2.6 is now the lowest supported version
• New support files to handle dependencies for pip users in extra/
• GPX 1.0 support has been removed
• KML support for versions older than 2.2 has been removed
• Unicode output guessing has been removed from edist
• Added a zsh completion script for edist
• PEP-3101 format support
• aaargh is now required
• lxml_ is no longer optional, and is now required for XML support
• The testsuite now requires expecter and nose2
• Added support for metadata in GPX files
• Added support for route data in GPX files