[offlineimap] Crash on OSX Yosemite python 2.7.6 (#205)

[Monson Shao]

It seems very easy to reproduce in my situation, where network latency is over 500ms. I have set the -1 option to disable multithreading.

```
 Copy message 227292 (87 of 859) XXX-remote:INBOX -> XXX-local
 Establishing connection to mail.corp.XXX.com:993
 ERROR: command: UID => socket error: <type 'exceptions.IOError'> - Too many read 0
 Establishing connection to mail.corp.XXX.com:993
 ERROR: command: UID => socket error: <type 'exceptions.IOError'> - Too many read 0
 ERROR: Copying message 227292 [acc: XXX]
  list.remove(x): x not in list
 ERROR: Syncing folder INBOX [acc: XXX]
  list.remove(x): x not in list
 ERROR: ERROR in syncfolder for XXX folder INBOX: Traceback (most recent call last):
  File "/usr/local/Cellar/offline-imap/6.5.7/libexec/offlineimap/accounts.py", line 567, in syncfolder
    remotefolder.syncmessagesto(localfolder, statusfolder)
  File "/usr/local/Cellar/offline-imap/6.5.7/libexec/offlineimap/folder/Base.py", line 979, in syncmessagesto
    action(dstfolder, statusfolder)
  File "/usr/local/Cellar/offline-imap/6.5.7/libexec/offlineimap/folder/Base.py", line 853, in __syncmessagesto_copy
    register = 0)
  File "/usr/local/Cellar/offline-imap/6.5.7/libexec/offlineimap/folder/Base.py", line 770, in copymessageto
    message = self.getmessage(uid)
  File "/usr/local/Cellar/offline-imap/6.5.7/libexec/offlineimap/folder/IMAP.py", line 280, in getmessage
    self.imapserver.releaseconnection(imapobj)
  File "/usr/local/Cellar/offline-imap/6.5.7/libexec/offlineimap/imapserver.py", line 162, in releaseconnection
    self.assignedconnections.remove(connection)
ValueError: list.remove(x): x not in list

  list.remove(x): x not in list
 Syncing INBOX/10F Renovation: IMAP -> Maildir
```

---
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https://github.com/OfflineIMAP/offlineimap/issues/205#issuecomment-129697387
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