Fix some punctuation errors.

Change-Id: I6aa2ad2b506466fbef6a22380d151988930807c9
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Fix generation of XCode projects for XCode 4.6

When a framework is referenced in the XCode project then it is known as
a framework by the lastKnownFileType and not the reference type. This
ensures it works in both XCode 3 and XCode 4.

Task-number: QTBUG-29371
Change-Id: I434246a46d6c5bfd50ba7de1a7c710c0caf0bc0a
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@digia.com>
Add snippet for QT_VERSION_CHECK.

Change-Id: I048771f21ce694329a7e9acd4dbfbebfec964b05
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>