Remove Bad Perf Test

- this just stresses scheduling and at this throughput creates massive garbage and tests the wrong thing
Merge pull request #1298 from benjchristensen/perf-transform

Remove Bad Perf Test
Introduced 'rxjava-scalaz' project.  This project provides some type class instances for Observable.

* Monoid: Observable obviously forms a monoid in terms of concatenation.
* Functor, Applicative, Monad, MonadPlus: Observable can be a Stream-like Monad and can be MonadPlus as well as Monoid.
* Traverse, Foldable: Observable can be Stream-like traversable. __NOTE: The operations for the instance is blocking calls.__
* etc.

About Testing, property based tests are applied by Scalaz's ScalaCheck binding.

For QuickStart, please refer to rx.java.scala.scalaz.examples.RxScalazDemo.
Add convenience method for adding unsubscription callback
replaced getOne method which is based on promise with toBlocking.first
rename variable childObserver to child (is now a Subscriber) and rename gps to group (is not plural)
Merge pull request #1301 from jbripley/subscription-block-expression

RxScala: Add convenience method for adding unsubscription callback
Add flatMap variants to RxScala
Add concatMap to RxScala
Merge pull request #1304 from zsxwing/flatMap

Add flatMap and concatMap to RxScala
Merge pull request #1302 from davidmoten/groupBy-naming

improve variable names in OperatorGroupBy
0.19.0-SNAPSHOT
everything defaults to 1.6
Hooked RxJavaPlugins errorHandler up within all operators that swallow onErrors.
* Otherwise, the only onErrors visible to plugin are the ones which propagate all the way to SafeSubscriber.
testNotificationDelay - Attempt at determinism
Merge pull request #1307 from benjchristensen/make-notificationDelay-deterministic

testNotificationDelay - Attempt at determinism
Remove call to RxJavaPlugins ErrorHander in mergeDelayError operator - CompositeException is already visible
Merge pull request #1306 from mattrjacobs/add-error-handler-to-error-swallowing-operators

Hooked RxJavaPlugins errorHandler up within all operators that swallow onErrors
Hide ChainedSubscription
Merge pull request #1309 from benjchristensen/subscriber-subscription

Hide ChainedSubscription/SubscriptionList from Public API