SimpleTriangleClosingVertex should not use ArrayWritable for a vertex value

Need to convert to (yuck) Text output for vertex values, hope my tuples don't get too long. I followed several instructions from Hadoop about subclassing and using existing ArrayWritables, always both methods will compile with 'mvn verify' nicely, but break in actual use. GiraphJob.run() seems to be the culprit. Don't know if I can solve this myself in a way that will be pleasing to everyone. See GIRAPH-227 if you can help fix this ArrayWritable problem. As far as the vertex example, I'll covert it (and related tests) to Text output now.

Thanks again to Sean Choi, who noticed this and used the same (Text for tuples) solution successfully.