fix jmh build config

This is now working from command-line and Eclipse
Merge pull request #991 from benjchristensen/jmh-build

JMH Benchmark Build Config
Migrate Pre-JMH Tests to rx.archive
JMH Benchmarks Gradle Config

- this allows running benchmarks
- config is hardcoded right now
- wasn't able to get uberjar/shadowjar functionality working (https://github.com/Netflix/RxJava/pull/963#issuecomment-38770680)
Perf Tests with JMH
Merge pull request #993 from benjchristensen/perf-tests

JMH Perf Tests