BibRank: restart WSGI app after citation indexing

• This patch is a workaround for the citation indexer memory troubles, when Apache WSGI daemon processes may end up doubling the memory after citation dictionary is updated; therefore let us restart the WSGI daemon application after the citation indexer finished, which relieves this problem. The restart is done via touching invenio.wsgi file. The proper fix for this problem would be a strict separation between citation indexer updating dicts and citation searcher loading dicts.