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