Upgraded to Reactor 1.0 M2 release

Author: jhoeller

build.gradle

@@ -318,8 +318,8 @@ project("spring-messaging") {
 		compile(project(":spring-context"))
 		optional(project(":spring-websocket"))
 		optional("com.fasterxml.jackson.core:jackson-databind:2.2.0")
-		optional("org.projectreactor:reactor-core:1.0.0.BUILD-SNAPSHOT")
-		optional("org.projectreactor:reactor-tcp:1.0.0.BUILD-SNAPSHOT")
+		optional("org.projectreactor:reactor-core:1.0.0.M2")
+		optional("org.projectreactor:reactor-tcp:1.0.0.M2")
 		optional("com.lmax:disruptor:3.1.1")
 		testCompile(project(":spring-test"))
 		testCompile("com.thoughtworks.xstream:xstream:1.4.4")