get rid of warnings & code enhancing
Merge remote-tracking branch 'origin/master'

Conflicts:
	src/main/java/org/aotorrent/common/connection/PeerConnection.java
	src/main/java/org/aotorrent/common/protocol/peer/PieceRequest.java
	src/main/java/org/aotorrent/common/protocol/peer/RequestRequest.java