Merge pull request #5 from hawkinswnaf/release-0.6.5.4

keyring_open_with_pins() is gone (plus Makefile spiff-up) - Still needs additional testing.
Fix mdp Makefile and properly open keyring file

1. Fix the mdp Makefile: It is called libservald.so,
not libserval.so

2. Properly open the keyring file: Must call keyring_
enter_pin(file, ""); to get access to the default
identities.