Added archive_type to Category Archive List, Bumped Canonical Sitemap Version Number

In the Category Archive section of the site list, under some
circumstances mt:ArchiveLink tag was returning empty because the
archive type was not specified.  So I added archive_type="Category" to
the mt:ArchiveLink.
Merge pull request #1 from After6Services/master

Resolved an Issue with Blank URLs in Category Archive Section of Generated Sitemap