Add version tag with J2SE version for improved searching

The date currently appears in the generated file as follows:

<!-- Generated by javadoc (build 1.5.0-rc) on Wed Aug 11 07:21:52 PDT 2004 -->

Search engines cannot easily parse this. The information would
be much more readily available if it were in a meta tag.

###@###.### 2005-1-06 20:12:13 GMT