Create /src/perf for Performance Tests

- Move existing performance tests into this source folder.
- Not building via Gradle yet … I have yet to figure that part out.
Start of Performance Testing Operators

These are examples of how we should proceed. Very likely though we want to use something like Caliper: https://code.google.com/p/caliper/
Merge pull request #760 from benjchristensen/perf-tests

Performance Tests Source Folder