Fixing a bug in the output that was printing blank lines.  Adding a p4
describe output to verify that the diffs are rendered.  Switching to
using the same OSS example for git and p4 (from Handlebars.java).

Still TODO:
* capture filenames from either git or p4 output.
* verify that this works against other git and p4 commands.
* verify that this works against "diff -u" unix program.