Added recipes for Scientific American and Discover Magazine

src/calibre/web/feeds/recipes/__init__.py

@@ -9,6 +9,7 @@ recipes = [
            'nytimes', 'usatoday', 'outlook_india', 'bbc', 'greader', 'wsj',
            'wired', 'globe_and_mail', 'smh', 'espn', 'business_week',
            'ars_technica', 'upi', 'new_yorker', 'irish_times', 'iht',
+           'discover_magazine', 'scientific_american',
           ]
 
 import re, imp, inspect, time

src/calibre/web/fetch/simple.py

@@ -198,7 +198,6 @@ class RecursiveFetcher(object, LoggingInterface):
                 except Exception, err:
                     self.log_warning('Could not fetch stylesheet %s', iurl)
                     self.log_debug('Error: %s', str(err), exc_info=True)
-                    if hasattr(f, 'close'): f.close()
                     continue
                 stylepath = os.path.join(diskpath, 'style'+str(c)+'.css')
                 with self.stylemap_lock: