Merge pull request #50 from swilli/master

Fixes issue #49: Faces with a score of zero don't display a label anymor...
Update README.md
Update README.md
Merge pull request #53 from swilli/master

Contains enhancement #52 and mission1 and mission3 scoring improvements.
Enlarging the max time of flight from Venus
Change Level1 parameters
Changed FILE_CACHING_TIME to 1 day.
[Mission 1]: Road to Jupiter. Redefinition of scoring system and planetary parameters
Merge pull request #56 from darioizzo/master

[Mission 1]: Road to Jupiter. Redefinition of scoring system and planeta...