Add a swift-enabled version of WordCount to edp-examples

The edp-wordcount example includes source code and instructions on
how to build the jar and run it from the Oozie command line or the
Savanna UI. WordCount will work with hdfs paths, or with swift paths
as long as the proper configs are set.

Change-Id: I9ac728de505d874fd50a6baf75b062d5b622f3d0