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* src/ [Connection, Error, Key, Keyring, MEssage, Signature, gpgmejs]:
Functions and values that are not meant to be overwritten are now
moved into their constructors, thus eliminating the possibility of
overwrites after initialization.
* Key: The mode of use (synchronous cached, or async promises) ivs now
determined at initialization of that Key. The property Key.isAsync
reflects this state.
* unittests: fixed old Key syntax for testing.
* Message.js isComplete is now a method and not a getter anymore.
* Added some startup tests.
94ee0988d4
