Merge remote-tracking branch 'upstream/master'
Merge pull request #356 from yuklai/master

Check for NULL in MCOAddress string functions before retain
Add MCOIMAPConnectOperation, include STARTTLS and auth methods in autoconfiguration
Merge branch 'master' of https://github.com/MailCore/mailcore2
Add MCIMAPConnectOperation* to project
Add to iOS target
Copy headers
Add MCIMAPConnectOperation.cc for cmake build
Merge pull request #358 from tokyovigilante/master

Add MCOIMAPConnectOperation to get server capabilities without logging in.
Documentation fix.
Merge remote-tracking branch 'upstream/master'
Merge pull request #364 from tiennou/quickfixes

Documentation fix.
Remove unused variables
Remove a few potential memory leaks
Merge pull request #369 from yuklai/master_leaks

Remove a few potential memory leaks
Remove unused variables
Remove unused variables
Merge pull request #368 from yuklai/master_unusedVariables

Remove unused varilables.
Fixed #367: fixed -hostnameWithEmail:
Fixed crash in MCIndexSet (fixed #357)