Log Message:
Update ZenTest package to 4.6.2.

Now it requires rubygems 1.8 at least.

=== 4.6.2 / 2011-08-24

* 1 minor enhancement:

  * Added Autotest Tips section to Readme

* 1 bug fix:

  * Fixed mri 1.9.3 change to Find.find with autotest/restart and missing files.