Failing tests for Collections
removing .gradle from version control, adding Collections to gradle build
passing tests for min of one-item collection and throwing exception when asked the min of multi-item collection
WIP interim refactor of Collections tests
minimum in collection
passing-when-written test for multiple lowest
failing test for collections.getmaximum
getmaximum
Refactored code for reuse
separating integer and string collections even though it'd duplicative because not sure how to handle them together without typecasting