Allow filtering of folders with spaces

This patch adds support to filter folders with the space caracter.

When the folder includes spaces, the folder name must be quoted.
This commit is basicaly a copy-paste of commit 81bd57e4

Signed-off-by: Hubert Pineault <hpineault@riseup.net>

offlineimap/repository/IMAP.py

@@ -717,6 +717,9 @@ class IMAPRepository(BaseRepository):
             try:
                 for foldername in self.folderincludes:
                     try:
+                        # Folder names with spaces requires quotes
+                        if ' ' in foldername:
+                            foldername = '"' + foldername + '"'
                         imapobj.select(imaputil.utf8_IMAP(foldername),
                                        readonly=True)
                     except OfflineImapError as exc: