Housekeeping
Add optional `print-dup?` arg to `freeze-to-stream!` (default to true)
Add autobench to tests
EXPERIMENTAL: Swap Snappy implementation org.xerial.snappy/snappy-java -> org.iq80.snappy/snappy

This (native Java) implementation appears to be about as fast as
the old (JNI) implementation, but has better support across more platforms.

Going to evaluate stability on this branch for possible later merging into master.
Bump version (1.1.0-beta2)