Merge pull request #2 from Ferengee/master

separate calculations into methods and create a module for generic methods and constants
Update star_calculator.py
Update contributers.txt
Update universe.py

Added MINUTES_PER_YEAR constant to universe module
Update star_calculator.py

Added MINUTES_PER_YEAR for clarity
Merge pull request #3 from sunkanmi-akintoye/master

Updated star_calculator.py and universe.py
Update contributers.txt
Update star_calculator.py

Added more stars/star systems to library.
Changed prompt to clarify stars as well as systems.