don't connect to myself
check existing data on startup
bugfix
some code changes
Merge remote-tracking branch 'origin/master'

Conflicts:
	src/main/java/org/aotorrent/common/Piece.java
	src/main/java/org/aotorrent/common/connection/AbstractTrackerConnection.java
	src/main/java/org/aotorrent/common/connection/HTTPTrackerConnection.java
	src/main/java/org/aotorrent/common/connection/UDPTrackerConnection.java
	src/main/java/org/aotorrent/common/storage/FileStorage.java
start implementing of incoming connections