Removing Leonardo (and Mouse/Keyboard examples) for Arduino 1.0 release.

These will return, but the code isn't finished yet so I don't want to include it.

Switching to RXTX-2.1-7r2 on 64-bit Linux (working version).

This also means we don't need a separate RXTXcomm.jar file for 64-bit Linux.
(cherry picked from commit 24e62aa)

Updating Mac Info.plist version to 1.0-rc2.

Updating Mac OS X Info.plist (.app) version to 1.0-beta4.

Fixes to compile under Java 1.5 (on my Linux machine).

Following symlinks in arduino launch script for Linux.

Updating version to 0021.

Updating version to 0020.

Tagging release 0019.

Tagging release 0018.