Clean up guides to link to proper javadoc pages and include code instead of use pasted copies

README.adoc

@@ -2,8 +2,8 @@
 tags: [messaging, websocket]
 projects: [spring-framework]
 ---
-:spring_version: 4.0.0.RELEASE
-:spring_boot_version: 0.5.0.M6
+:spring_version: current
+:spring_boot_version: 1.0.0.RC3
 :MappingJackson2MessageConverter: http://docs.spring.io/spring/docs/{spring_version}/javadoc-api/org/springframework/messaging/support/converter/MappingJackson2MessageConverter.html
 :Component: http://docs.spring.io/spring/docs/{spring_version}/javadoc-api/org/springframework/stereotype/Component.html
 :jackson: http://wiki.fasterxml.com/JacksonHome