Added a scheduler for scheduling actions on the Swing event thread.
Merge branch 'master' into SwingScheduler
adapted SwingScheduler to new Scheduler interface
fixed formatting and removed superfluous checks
Merge branch 'master' into SwingScheduler
Implemented periodic scheduling, too. Needs testing now.
Added tests against periodic scheduling. I hope the delays are stable
yet fast enough...
Created `extensions` subdirectory for non-core additions to RxJava and
moved `SwingScheduler` into a new subproject `rxjava-swing`.
Tested whether the actions are really executed in the EDT.
Increased test delays.
Renamed `extensions` to `rxjava-contrib`.
Fixed links in the javadocs, mostly.
Fixed everything but empty return tags.
Cleaned up all empty `@return` tags, too.
Removed some unused code, fixed some (Eclipse) warnings
Merge pull request #254 from jmhofer/SwingScheduler

Swing scheduler
Merge pull request #255 from jmhofer/fix-build-warnings

Cleaning up - fixing a lot of build warnings (mostly javadoc)