Getting ready for KGW. This version still will not go over 5400 blocks.

Committer: nite69
Changes to be committed:

	modified:   core/src/main/java/com/google/bitcoin/core/AbstractBlockChain.java
	modified:   core/src/main/java/com/google/bitcoin/core/Peer.java
	modified:   core/src/main/java/com/google/bitcoin/core/PeerGroup.java
	modified:   core/src/main/java/com/google/bitcoin/utils/ExponentialBackoff.java
	new file:   core/src/main/java/org/auroracoin/AuroraBlockChain.java