Modifications to models

1. Fixed more relationships.
2. Detailed BranchModification adding BranchCreation, BranchDeletion and
BranchUpdate.
Merge branch 'master' of https://github.com/ChocolateEleven/SCUT-Club-Management-System

Conflicts:
	SCUTClubManager/DAL/SCUTClubContext.cs
	SCUTClubManager/Models/Asset.cs
	SCUTClubManager/Models/AssetAssignment.cs