Changed XHTML1 source generation

Now really removes all instances of @role and @aria-level when
generating XHTML 1
Changed previous recommendation header

Now Matches best practice according to W3C pubs.  Uses 'Recommendation'
instead of 'recommendation' and shows 'Previous Recommendation' if
status is REC and there was a previous REC.  These changes at the
request of Ivan Herman and backed up by evidence in a non-ReSpec
produced recent W3C Recommendation at
http://www.w3.org/TR/2013/REC-rdf-sparql-XMLres-20130321/
Fixed tests to recognize new header content.
Reset Latest header based upon feedback.
Merge remote branch 'upstream/develop' into develop
Merge pull request #253 from halindrome/develop

Changed XHTML1 source generation