Message Splitter

[Danny Sullivan]

Hey everyone,
To test functionality, instead of adding "this, is, my, split, message" to the 
List returned by the split method in PushActivityConsumer I added the original 
json activity string (the "activities" parameter) to the List. This issue is 
reported here: https://issues.apache.org/jira/browse/STREAMS-17. While I think 
my change is useful for testing purposes, I wanted to get an idea of what the 
"split" method is actually supposed to be doing before I submit a patch.
Danny