ddlnya udah ada default, relasi udah bisa null
Merge remote-tracking branch 'origin/master'

Conflicts:
	BioPM/BioPM.v11.suo
	BioPM/BioPM/Web.config
	BioPM/BioPM/bin/BioPM.dll
	BioPM/BioPM/bin/BioPM.pdb
	BioPM/BioPM/obj/Debug/BioPM.dll
	BioPM/BioPM/obj/Debug/BioPM.pdb