Merging changes from original project
Merge remote-tracking branch 'upstream/master'
Project local build settings
Merge remote-tracking branch 'upstream/master'
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