Refactoring message and key class. Implement decryptMessage.
Further clean up in message and key class. Make tests run.
remove travis.yml on devel branch since Integration tests dont yet work here
reactive travis.yml but do nothing in npm test until devel branch is ready for testing
Remove keyring from openpgp namespace. Optimize keyid initialization.
Merge pull request #121 from toberndo/devel

devel branch: work on key and message class