many changes to zoneinfo, and to the download mechanizm
Handle symbolic links in the zoneinfo tar file
Package is now wheelable!
Changed the reading of the tar.gz file.
gracefully fail on missing zoneinfo, to allow "bootstaping" for updatezinfo
fix syntax to work on python2.6, and load the tz tar file only on first access
FIX: work on python2.6
Merge branch 'revise-zoneinfo'