Switch to rxnetty-http dependency

The "rxnetty" artifact is old (October 2015). There is now rxnetty-http
and other modules that have more recent snapshots (December 2015).

spring-web-reactive/build.gradle

@@ -45,7 +45,7 @@ dependencies {
 	compile "commons-logging:commons-logging:1.2"
 
 	optional 'io.reactivex:rxjava:1.1.0'
-	optional "io.reactivex:rxnetty:0.5.0-SNAPSHOT"
+	optional "io.reactivex:rxnetty-http:0.5.0-SNAPSHOT"
 	optional "com.fasterxml.jackson.core:jackson-databind:2.6.2"
 	optional "io.projectreactor:reactor-stream:${reactorVersion}"
 	optional "io.projectreactor:reactor-net:${reactorVersion}"

spring-web-reactive/src/main/java/org/springframework/http/server/reactive/RxNettyHttpHandlerAdapter.java

@@ -24,9 +24,6 @@ import org.reactivestreams.Publisher;
 import reactor.core.publisher.convert.RxJava1Converter;
 import rx.Observable;
 
-import org.springframework.http.server.reactive.HttpHandler;
-import org.springframework.http.server.reactive.RxNettyServerHttpRequest;
-import org.springframework.http.server.reactive.RxNettyServerHttpResponse;
 import org.springframework.util.Assert;
 
 /**