Fix windows line endings in offline compress

django itself always opens template files in binary mode, which causes an issue with offline compression on windows when template files contain windows line endings.

compressor/management/commands/compress.py

@@ -219,8 +219,8 @@ class Command(NoArgsCommand):
         compressor_nodes = SortedDict()
         for template_name in templates:
             try:
-                with io.open(template_name, encoding=settings.FILE_CHARSET) as file:
-                    template = Template(file.read())
+                with io.open(template_name, mode='rb') as file:
+                    template = Template(file.read().decode(settings.FILE_CHARSET))
             except IOError:  # unreadable file -> ignore
                 if verbosity > 0:
                     log.write("Unreadable template at: %s\n" % template_name)