Update IngentaConnect.js

 * multiple was not working anymore
 * cleaning of date was only working for "January, 1st" dates and moreover we really shouldn't delete day and month if present.
 * cosmetics (functions getSearchResults, getRisUrl)
I'm guessing that the `-01-01` part is meaningless and is used only as a placeholder, which is why it was being removed. I agree with your change if there are dates that are not January 1, but I think you might also want another `replace` that removes `-01-01` part as well.