Implement the Branch methods of the API

[malkam03]

The following methods must be implemented:

Method	Resource	Param	Body	Result
GET	https://url/branches/	BranchID*	-	Branch info(if no id is provided, return all branches)
PUT	https://url/branches/	-	Branch	Status code
UPDATE	https://url/branches/	BranchID	Branch(blank are left unmodified)	Status code
DELETE	https://url/branches/	BranchID	-	Status code

* optional parameters.