Support for get/set the extension flags for CTCoreMessage.
Add Fetching mail with UID or Sequence number Index set.
Merge pull request #90 from pitiphong-p/fetch_with_indexset

Add Fetching mail with UID or Sequence number Index set.
Rename the mail core utility functions. Add the 'MailCore' namespace.
Fix to CTSMTPAsyncConnection so that it can also use SMTP with SSL on port 465.
Copied the changes made in the commit to CTSMTPConnection 2ac9928971ca on 20th November 2012 to enable the same feature.
Merge pull request #93 from DanGonz/master

Fix to CTSMTPAsyncConnection so that it can also use SMTP with SSL on port 465.
Merge pull request #84 from pitiphong-p/extionsion_flags_support

Support for get/set the extension flags for CTCoreMessage.
merge master