update Rx version to 0.20.+ and Scala version to 2.10.+
add -deprecation and -feature to all build.sbt
update source code of examples to RxScala 0.20.4
add .settings to gitignore
change Scala 2.10.+ to Scala 2.10.4 and Rx 0.20.+ to 0.20.4
script which runs a given command in all subdirs which contain a build.sbt file
perform GUI construction on event dispatch thread, not on main thread

noticed the issue thanks to the changes in https://github.com/ReactiveX/RxJava/pull/883