Merge pull request #1 from MailCore/master

Syncing my fork...
Fixed #847: make performMethodOnDispatchQueueAfterDelay thread safe
Fixed progress report for MCOIMAPFetchMessagesOperation
Fixed warning (fixed #852)
Add IMAP search body
Add allows new permanent flags property in folder info.
Clarify the difference between -searchBody: and -searchContent:
Merge pull request #854 from PrapatB/IMAP-Search-Body

Add IMAP search body
Fixed typo in a documentation.
Merge pull request #864 from robario/patch-1

Fixed typo in a documentation.
Fixed date formatter, CoreFoundation format
Use correct constants
Initialize the allow new permanent flags default value.
Merge pull request #855 from pitiphong-p/allows-permanent-flags

Add allows new permanent flags property in folder info.
Updated to libetpan 51ca6bfc3c
Added support for Juno
Update providers.json
Update providers.json
Added entry for mail.com
Added support for hushmail.