Example node tests

[mstriemer]

Here's what I was thinking for running the tests in node. Obviously some cleanup is required. We'd have to use the shallow renderer for the basic stuff. I'm not sure what we'd do once we've got redux + fetching setup so maybe this should wait until then. Food for thought I guess.

I was sitting on the code for #62 so I just left it there cause this is pretty small.

[mstriemer]

It's probably worth noting that shallow rendering is "experimental".

[muffinresearch]

I'm not sure I understand this. It appears to just run the test via mocha which isn't testing server-side rendering in any way unless there's something I'm missing or there's some magic involved.

[mstriemer]

It's actually slower to run the tests in node, probably because of webpack needing to bundle everything. This isn't too useful locally and we might not need it at all.