setup.py: Removed testing stuff

We use py.test and don't need setup.py integration for that...
setup.py: Moved requirements into setup() call
setup.py: Removed obsolete ez_setup reference
setup.py: Use __about__ values
Merge pull request #225 from Turbo87/setup.py

Several modifications for setup.py
i18n: Updated German translation
i18n: Updated Polish translation
Merge pull request #227 from Turbo87/i18n

Updated translations
statistics: Show total number of pilots with flights
statistics: Added club/airport-filter to show correct number of pilots
Merge pull request #247 from ScotteC/master

statistics: Show total number of pilots with flights (Issue: #228)