Merge pull request #171 from tbak/2.x

Integration of registration protocol with EurekaServerService API
Merge pull request #175 from tbak/2.x

Update eureka-client to use new domain model with Delta class.
Comment out mavenLocal()
Delta should be serializable
Adding diff methods to InstanceInfo to generate sets of Deltas
from two instanceInfos.
Removing delta tests for Long type as they are no longer a supported
delta variable type.
Test clean up with SampleDelta and SampleInstanceInfo
Removing old usages of Java serialization
Update version when applying Delta in InstanceInfo.Builder.
Merge pull request #177 from qiangdavidliu/2.x

Diff to generate deltas from instanceInfo
Merge

Conflicts:
	eureka-server/src/test/java/com/netflix/eureka/server/transport/discovery/protocol/asynchronous/AsyncDiscoveryServerTest.java