This is mostly in response to the pre-existing PR #731, so we can track it as an issue in the next set of ESAPI release notes.

This does some minor clean-up of the reports produced by 'mvn site'. They look a bit nicer and correctly display copyright dates, etc. However, because it doesn't actually fix the ESAPI tag library documentation, it actually makes those indices disappear completely from the navigation sidebar. Because of that, I created issue #733 so that we don't forget that we still need to try to fix that.