Migrate Schedulers to rx.schedulers package
Organize Imports - Migrate to rx.schedulers for src/main
Backwards compatible deprecated rx.concurrency classes

These will exist for a few releases to allow people to migrate from rx.concurrency to rx.schedulers.
rx.concurrent -> rx.schedulers for Android and Swing modules
Migrate code to use rx.schedulers instead of rx.concurrency

Unit tests passed before and after (did change in multiple steps to assert unit test pass against rx.concurrency before migrating to rx.schedulers).
Add Missing License Headers
Merge pull request #599 from benjchristensen/rx.schedulers

Refactor rx.concurrency to rx.schedulers