add an inflate test

This CL adds a (failing) test for inflate. This data is the same as what we're sending into a JS inflate implementation, and it succeeds. I make no particular guarantees that the test data is correct :) Hopefully this will turn up something obvious.

I can work on generating a good test suite - using something like the Java inflate and deflate implementation. Probably wouldn't be able to commit to doing that in the near-term though -