Initial commit
Created Mammal Class w/ legs and feeds_with method
Added Bird class & 3 birds
Built a Zoo class w/ search
Added deeper search
upgraded to ruby 2
Refactored classes to keyword arguments
Added validation for Fixnum on age & legs
Refactored raise argument to one-liner
Merge pull request #4 from kkampen/feature/mammal_class

Feature/mammal class