[WIP] Added matrix test.

[petevg]

This needs some refinement -- right now, it's just a copy of one of our
existing matrix test examples, with the hadoop bundle replacing
wiki-simple.

@cory_fu: my plan was to simplify this test after I got it verified working. We run into issues w/ the first deploy, though; apologies for the dust.

[johnsca]

I feel like we need to parameterize the test in matrix to accept any bundle. That is, this shouldn't really live in the bundle, but the bundle might contain a traffic plugin to generate Hadoop-specific work to run while glitch is running.

[petevg]

Agree w/ @johnsca: We should parameterize bundle passing for the standard matrix test, rather than requiring everyone to drop a .matrix file into their bundle.