Add member lastResult to each classes.
Implement method errorMessage.
Remove return param error message from method lock.
Remove return param error message from method unlock.
Remove return param error message from method remove.
Remove receive error message from test code.
Bypass lock Keychain test.
Add test YCKeychainItemTest into project
Fix Code Sign
Add member lastResultString.
Add method errorMessage.
Merge branch 'feature/AddMemberOSStatusForLastError' into develop