Add new style for JITE

... JITE = Journal of Institutional and Theoretical Economics.

 * English style by German publisher
 * This style looks quite similar to the Chicago Manuals Style, but they don't mention anything in their style guide.
 * Update finanzarchiv.csl: Add pages in chapter/inproceeding (forgot before #1115)
@zuphilip, where does the second ISSN come from? http://www.mohr.de/en/nc/journals/economics/journal-of-institutional-and-theoretical-economics-jite/journal.html says:

ISSN 0932-4569 (Print Edition)
ISSN 1614-0559 (Online Edition)