(/=) Fix Logging.

-the main point was to change from a set to a priority queue in the
MessageSequencer.
Merge branch 'master' of https://github.com/glukas/DistributedSystemsProjects

Conflicts:
	Ex3/vs-glukas-chat/src/ch/ethz/inf/vs/android/glukas/chat/Logger.java

Ex3/vs-glukas-chat/src/ch/ethz/inf/vs/android/glukas/protocol/ChatLogic.
java

Ex3/vs-glukas-chat/src/ch/ethz/inf/vs/android/glukas/protocol/ChatMessag
e.java

Ex3/vs-glukas-chat/src/ch/ethz/inf/vs/android/glukas/protocol/MessageSeq
uencer.java

Ex3/vs-glukas-chat/src/ch/ethz/inf/vs/android/glukas/protocol/MessageSeq
uencerDelegate.java