Fix #40: throw an error when no scheme is supplied
Enhance command line logging
Fix #48: Plain error message on not found passphrase
Fix #54: Import data store by iterating over it's data
Ref #53: add bool import flags for overwrite,theirs,yours
Fix #54 #53: Implement merging strategies on import
Merge branch 'feature/refactor_import_command' into develop
Add crypto and openpgp package
Move encryption/decryption functionalities in the crypto package
Add encryption algorithm selection constants
Merge branch 'feature/refactor_encryption' into develop