Fix #2128 (Google Books Fetch Metadata Fails With Apostrophe In Title)

src/calibre/ebooks/metadata/google_books.py

@@ -64,6 +64,8 @@ class Query(object):
             if publisher is not None:
                 q += build_term('publisher', publisher.split())
 
+        if isinstance(q, unicode):
+            q = q.encode('utf-8')
         self.url = self.BASE_URL+urlencode({
             'q':q,
             'max-results':max_results,