change params management, replace ConfigObj by ConfigParser

test/sigal.conf

@@ -0,0 +1,19 @@
+
+[sigal]
+
+# size of resized image
+img_size = 640x480
+# prefix for thumbnails name
+thumb_prefix = TN-
+# thumbnail size
+thumb_size = 150x112
+# keep big image
+big_img = 1
+# generate squared thumbnails
+square_thumb = 1
+# jpeg quality
+jpg_quality = 90
+# keep exif metadatas in output image
+exif = 1
+# add a copyright text on the image
+copyright = 1