Issue #209 : rename PacoDate to PacoDateUtility
Issue #209 : add a new class PacoScheduleGenerator to handle generating experiment schedule dates
Issue #209 : move all experiment related logic from PacoDateUtility to PacoScheduleGenerator
Issue #209 : add placeholder test file for new class PacoScheduleGenerator
Issue #209 : add all tests from PacoDateUtilityTests to PacoScheduleGeneratorTests
Issue #209 : remove legacy test code from PacoDateUtilityTests.m