Change base class in CompositeEurekaEnabledNIWSServerList to AbstractServerList

to inherit zone filtering capabilities.

ServerList implementation for Eureka2

Removed overriding of BaseLoadBalancer#setPing from DynamicServerListLoadBalancer

Fixed issue #182 of original project

Add ability to set headers on HttpRequestBuilder

Added listener notification on server status changes to BaseLoadBalancer

Fixed PrimeConnectionsClassName to have String type

Remove fixed inital delay for dynamic server list reload

#224: Use the same duration for the initial delay as well as subsequent refreshing of the dynamic server list

+ composite dispatching to Eureka1 or Eureka2 depending on the configuration
+ unit test bug fixes

Switch to rxnetty 0.4.6 in the io.reactivex org.

Fixed ReceiveBuffferSize typo

Modifications:

Renamed ReceiveBuffferSize to ReceiveBufferSize

This is not backwards compatible if there's people using this configuration already.

Motivation:

`CommonClientConfigKey.PrimeConnectionsClassName` is typed as `IClientConfigKey<Boolean>`
which is incorrect since it must be a `String`

Modifications:

Make `PrimeConnectionsClassName` a constant of type `IClientConfigKey<String>`

Result:

Fixes #207

Motivation:

DynamicServerListLoadBalancer implementation of setPing does not call super.setPing
which causes the load balancer to completely ignore the ping interval configuration.

Modifications:

Removed unnecessary overriding of setPing

Result:

Ping interval configuration works as expected.

Add cleanup mechanism for ServerStats

fix #191 - boolean cannot be used with gauge

ServerListUpdateInProgress change should be atomic

Dependency cleanup

NetflixOss Build

Using an atomic compareAndSet, instead of separate get and set operations.