Add options to insert a version history table

[supcik]

I would like to insert a version history table in some of my documents. I found the vhistory package that does the job.

So I edited the template and defined some options for the front-matter. The additional examples should give an idea on how to use them.

Note that if the date is not explicitly defined in the front-matter, it is then taken from the last entry of the history table.

If you like the idea, I can write a paragraph or two in the README to document the option.