Update search engine detection for Yahoo! and Babylon #2304

1. Allow wildcard matching on subdomains, e.g., '*.example.com' (but not as the primary URL).
   • May not allow more complex cases, e.g., .example.{}, or .example.com/path.
2. Allow path matching where keyword parameter is unspecified, e.g., search.example.com/path/* (where * is the keyword)

From #2319 and the forum:

 us.yhs4.search.yahoo.com/yhs/search;_ylt=A0oG7qCW9ZhNdFQAuTQPxQt.?q=xxxxxxx
 us.nc.yhs.search.yahoo.com/if?p=keyword1+keyword2+keyword3&partnerid=yhs-if-timewarner&fr=yhs-if-timewarner&ei=UTF-8&YST_b=7&vm=p
 search.babylon.com/web/xxxxxx

(In [4696]) fixes #2304

This is the quick fix. Wildcard matching just isn't workable in the current algorithm. The "right" way may be to extract the "provider" (similar to the Provider plugin, or using the Public Suffix List).

quick fix is good :)