Add a feeds plugin, using all images sorted by date.

tests/sample/sigal.conf.py

@@ -9,7 +9,8 @@ keep_orig = True
 links = [('Example link', 'http://example.org'),
          ('Another link', 'http://example.org')]
 
-plugins = ['sigal.plugins.adjust', 'sigal.plugins.copyright', 'sigal.plugins.watermark']
+plugins = ['sigal.plugins.adjust', 'sigal.plugins.copyright',
+           'sigal.plugins.watermark', 'sigal.plugins.feeds', ]
 copyright = u"© An example copyright message"
 adjust_options = {'color': 0.0, 'brightness': 1.0,
                   'contrast': 1.0, 'sharpness': 0.0}
@@ -20,6 +21,9 @@ watermark_opacity = 0.3
 theme = 'colorbox'
 thumb_size = (200, 150)
 
+rss_feed = {'feed_url': 'http://example.org/feed.rss', 'nb_items': 10}
+atom_feed = {'feed_url': 'http://example.org/feed.atom', 'nb_items': 10}
+
 # theme = 'galleria'
 # thumb_size = (280, 210)
 # show_map = True