Add support for outgoing mail priority header.
Beautify the code. With 120 character page guide.
Fixed crash when XLIST command return \NoInferiors flag.
Implement [CTCoreMessage isDeleted].

This cleans up some almost-copy-and-paste code at the same time.
Put the hard-coded error domain name in a #define.

This allows callers to use the name without hard-coding it themselves.
Merge pull request #109 from tipbit/define-error-domain

Put the hard-coded error domain name in a #define.
Merge pull request #108 from tipbit/is-deleted

Implement [CTCoreMessage isDeleted].
Merge pull request #105 from pitiphong-p/fix_crash_xlist_return_NoInferiors

Fixed crash when XLIST command return \NoInferiors flag.
Merge pull request #91 from pitiphong-p/outgoing_priority_header

Add support for outgoing mail priority header.
Updated readme
modify status method，add folder flags for XListResult
Merge remote-tracking branch 'mronge/master'

Conflicts:
	Source/MailCoreUtilities.h