Casper Extension Attribute script to detect Java build 1.6.0_51-b11-457-11M4508.

This Casper Extension Attribute determines if the following Java build
is installed: 1.6.0_51-b11-457-11M4508. This build was installed by the
first versions of Java for OS X 2013-004 and Java for Mac OS X 10.6
Update 16 and can cause problems for Java Swing applications like
MATLAB and Papercut.