Serialization enhancements, tests
Started the DHT rewrite
Addresses in dht are now assigned to awaiting dht slots
Miner logic completed
NettySender is now generic
BranchSyncTask now triggers a callback when finished
Introduced the GetClockRequest class
Completed the GetDiffTask
Optimized imports
Merge branch 'feature-sync' into develop

Conflicts:
	src/main/java/org/aldeon/core/Core.java
	src/main/java/org/aldeon/core/CoreImpl.java
	src/main/java/org/aldeon/utils/json/JsonParserImpl.java