ComputationScheduler -> EventLoopsScheduler

- This implementation is used by Schedulers.computation() but is actually a pool of event loops, so renaming.
Restoring parallel() to using Schedulers.computation()

See https://github.com/Netflix/RxJava/issues/713 for background on this.
Merge pull request #1052 from benjchristensen/computation-scheduler

Scheduler Cleanup
Remove deprecated rx.util.functions.*

- organized imports and fixed few places that were still accidentally using the old package
Remove deprecated methods/classes from rxjava-core

Cleanup on path to 1.0: https://github.com/Netflix/RxJava/issues/1001#issuecomment-40888251
Merge pull request #1053 from benjchristensen/deprecation-cleanup

Deprecation Cleanup