bump imaplib2 from v2.52 to v2.53

Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>

offlineimap/imaplib2.py

@@ -17,9 +17,9 @@ Public functions: Internaldate2Time
 __all__ = ("IMAP4", "IMAP4_SSL", "IMAP4_stream",
            "Internaldate2Time", "ParseFlags", "Time2Internaldate")
 
-__version__ = "2.52"
+__version__ = "2.53"
 __release__ = "2"
-__revision__ = "52"
+__revision__ = "53"
 __credits__ = """
 Authentication code contributed by Donn Cave <donn@u.washington.edu> June 1998.
 String method conversion by ESR, February 2001.
@@ -51,7 +51,8 @@ Fix for correct byte encoding for _CRAM_MD5_AUTH taken from python3.5 imaplib.py
 Fix for correct Python 3 exception handling by Tobias Brink <tobias.brink@gmail.com> August 2015.
 Fix to allow interruptible IDLE command by Tim Peoples <dromedary512@users.sf.net> September 2015.
 Add support for TLS levels by Ben Boeckel <mathstuf@gmail.com> September 2015.
-Fix for shutown exception by Sebastien Gross <seb@chezwam.org> November 2015."""
+Fix for shutown exception by Sebastien Gross <seb@chezwam.org> November 2015.
+Add support for server BINARY mode (supplied by offlineimap-project) November 2015."""
 __author__ = "Piers Lauder <piers@janeelix.com>"
 __URL__ = "http://imaplib2.sourceforge.net"
 __license__ = "Python License"
@@ -1383,7 +1384,10 @@ class IMAP4(object):
             self.literal = None
             if isinstance(literal, string_types):
                 literator = None
-                data = '%s {%s}' % (data, len(literal))
+                if 'BINARY' in self.capabilities:
+                    data = '%s ~{%s}' % (data, len(literal))
+                else:
+                    data = '%s {%s}' % (data, len(literal))
             else:
                 literator = literal