Added functionality to search donor by DIN (#167)
Code refactoring of donationNumber to donationIdentificationNumber(#167)
Change incorrect usage of donorNumber to donationIdentificationNumber
AddDonorRepositoryTest to test search by DIN
Merge pull request #175 from jembi/Add_functionality_to_search_for_Donor_using_DIN_#167-

Add functionality to search for donor using din #167