Merging changes from original project
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Cert Check
Project local build settings
Merge remote-tracking branch 'upstream/master'
Proper certificate validation
Merge remote-tracking branch 'upstream/master' into SSL-Check-Certificate
Style fixes
Merge remote-tracking branch 'upstream/master'
Added not search expression in order to have searchexpressions such as, 'subect does not contain', 'email address is not on to list'
Added IMAPSearchKindNot to MCOMessageConstants.h as well
reverted changes on project.pbxproj
Merge pull request #623 from pfennema/master

add new searchexpression with NOT operator
Handle NULL strings appropriately
Check for NULL certs
Merge pull request #621 from CodaFi/SSL-Check-Certificate

SSL certificate check for other platforms
Fixed #396: link with icucore explicitely
Added comment about QRESYNC and syncMessages behavior (#238)
Cancel all operations
Implement Gmail Message ID search