Removes weird entry in the .gitignore file
Turns a TimestampedContact into a case class
Removes unused return value from method
Adds tests to the IdDistanceSpace and fixes a bug found
Adds more tests to the IdDistanceSpace
Adds more tests to the KadActNode

Since looking for values wasn't yet implemented, it now shows in one of the (ignored) tests
Move bucket and its implementations to their own package