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add toNullBinding() and toNullableBinding() and lazy counterparts, removed deprecated API

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change method signature

update to RxJavaFX 2.2.0

update to RxJavaFX 2.1.1, with nullSentinel support for ObservableValue.toObservable()

correct toLazyBinding() to call correct functions

that should not have been deprecated

update version number

deprecate any extensions to CompositeObservable

implement toBinding(), subscribeOnFx(), and observeOnFx() for other reactive types, deprecate eagerConnect()

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drop files