Bring in statsample for statistical calculations.
Make Model::Shot quack more like a number.
Use Aisling's data to generate better tests for 10m air rifle.
Point to https rubygems and upgrade gems.
10m air rifle targets are inward gauging.
Clean up spec/shooting_stats/shooting_stats_spec.rb
Do less work in the constructor.
help_message is an instance method, not a class method.