Initial gradle settings and defined the contract that we intend to implement for ParallelObservables

Adjusted the packages and added skeletal tests and perf classes
Large number of additions to get a building workspace.  Includes a much larger surface than initially anticipated but our starting point is parity with RxJava
Fleshed out initial perf tests
Adding initial implementation of parallel merge
Merge pull request #2 from ReactiveX/Initial-Work

Initial work