restore original gradlew
add one missing import
deleting def observable[T](=>T) requires deleting corresponding demo, too
reorg imports of ImplicitFunctionConversions
make zip with selector function private because

Scala collections do not have such a function, and we want to be
as close to Scala collections as possible
scaladoc links in ThreadPoolForXxxScheduler
scaladoc for package rx.lang.scala
restore subjects package object for scaladoc
Merge pull request #1 from samuelgruetter/RxJavaBugFixesSam

A few trivial Scala adaptor details
Pulled in changes from Samuel.
Fixed tests, all working without warnings
Added Observable.create.
(a) it will stop the pointless discussions around it.
(b) it is removes the interference with from(T*)
(c) we should remove the latter, since that is not the common case.
Double negation Observer.
Made subjects safe
Trivial code movements
IntelliJ suggested style changes.
Added release notes for Observer.
Added missing empty implementations for Observer methods.
Release notes
Added overrides.
Strange changes ...
Removing BooleanSubscription