Added the JCIP annotations as a dependency
  * Added the Java Concurrency in Practice annotations as a dependency
  * Annotated `Optional` as an example.
Driver Singleton cleanup
  * Removed the named parameter `DriverSingletons` as it wasn't safe with Tang
  * Added the service event handlers to the class `DriverSingletons` as a dependency instead to make sure they are only instantiated once per Driver.
Merge pull request #800 from Microsoft-CISL/weimer_singletons

Driver Singleton cleanup
Merge pull request #799 from Microsoft-CISL/weimer_jcip

Add the JCIP annotations as a dependency
Merge remote-tracking branch 'origin' into reef-bridge