Increase test and benchmark coverage

[pboyd04]

This does a few things to tests:

1. Ensure those with go routines actually complete as expected and not just rely on luck.
2. Increase the number of benchmarks
3. Actually compare the encoding result of the data to ensure it is accurate (the tests were just using go logic to decode to verify and if you make changes to the encoder that may still pass even though the actual output was bad. This resolves that.)
4. Adds a Reset method to Encoder. Right now this is just used for making the Benchmarks more accurate. In the future this will be used to increase the throughput of the encoder.