CDAP-538: Ported procedures of WordCount app to services.

@ParthGandhi The WordCount app has been updated with services instead of procedures, please take a look.
You should check for the status of the Service using something similar to: https://github.com/caskdata/cdap/blob/develop/cdap-unit-test/src/test/java/co/cask/cdap/test/app/TestFrameworkTest.java#L445

This method would ideally be part of the ServiceManager itself, but we're gonna do that fix next release.