Fixed incorrect JSON return values for findElements when an error occurs.

This is a "best-faith" effort at resolving reports of NullPointerExceptions in Java. If future occurrances of the symptoms are found, please open a new issue. Fixes issue #3800.
Bumping IEDriverServer version number to 2.30.0 for impending release.

Includes updated prebuilts and most recent changes to the JavaScript
automation atoms.