Catch cPickle.PicklingError on python 2 (#191).

sigal/compat.py

@@ -34,6 +34,7 @@ if not PY2:
     from http import server
     from urllib.parse import quote as url_quote
     import socketserver
+    import pickle
 else:
     text_type = unicode  # NOQA
     string_types = (str, unicode)  # NOQA
@@ -46,6 +47,11 @@ else:
     import SimpleHTTPServer as server  # NOQA
     import SocketServer as socketserver  # NOQA
 
+    try:
+        import cPickle as pickle
+    except:
+        import pickle
+
 
 class UnicodeMixin(object):
     if not PY2:

sigal/gallery.py

@@ -29,7 +29,6 @@ import fnmatch
 import logging
 import multiprocessing
 import os
-import pickle
 import sys
 import zipfile
 
@@ -40,7 +39,7 @@ from itertools import cycle
 from os.path import isfile, join, splitext
 
 from . import image, video, signals
-from .compat import PY2, UnicodeMixin, strxfrm, url_quote, text_type
+from .compat import PY2, UnicodeMixin, strxfrm, url_quote, text_type, pickle
 from .image import process_image, get_exif_tags, get_exif_data, get_size
 from .settings import get_thumb
 from .utils import (Devnull, copy, check_or_create_dir, url_from_path,