WIP, add hours sheet item model
WIP, add uniqueness to :name
WIP, add hours sheet category model
WIP, add FK from hours sheet item to hours sheet category
WIP, add hours sheet model, add relationships between models
WIP, add spec to test multiple categories per sheet
WIP, update factories with auto creates
WIP, updates specs
WIP, udpate specs
WIP, refactor specs
WIP, decouple users from hours sheet in lieu of hours sheet submissions
WIP, add hours sheet submission model, refactory factories and tests
WIP, refactory User and HoursSheetSubmission specs