Added extra rules for author etc.

authors, funders, sponsors and contributors are now no
longer converted to respStmts but rather to the appropriate
TEI elements in the titleStmt.

fixes issue TG-1921 for the aggregator: 
TextGrid-MD to TEI mapping is not capturing author etc. in a useful way 
https://develop.sub.uni-goettingen.de/jira/browse/TG-1921

git-svn-id: https://develop.sub.uni-goettingen.de/repos/textgrid/trunk/services/aggregator@13860 7c539038-3410-0410-b1ec-0f2a7bf1c452