[Enh] Change icon of list schedule category
[Enh] Change model for core data
[Fix] Core Data - Change the relationship between CDShift and CDMember
[Enh] Shift Category
Merge branch 'Core-Data'

Conflicts:
	Nurse Management.xcodeproj/project.pbxproj
	Nurse Management/Classess/Controllers/iPhone/EditShiftVC.xib