WebUI: Remove npm registry changes
XD-2487 Reactor based MessageHandler for processors

XD-2487 : Create a Reactor based MessageHandler for processors

Updated with PR Review comments

* fix typos in various places
* change compile time dependency from dirt to spring-integration-core
* add timeout to receive calls in test
* remove unused service-activator in XML test config
XD-2487 Polishing

   Fix the tests to use distinct channels/messages
   Add service activator for pojo processor
   Fix compiler warnings
XD-2484 Update spring-data-hadoop version to 2.1.0.M3
XD-2483 Add codec option to hdfs-dataset sink
XD-2409 Changing correlation-strategy-expression

- partial reversal of earlier change to avoid errors when payload is a String