Merge branch 'master' of http://github.com/qgis/Quantum-GIS.git
Merge branch 'master' of https://github.com/qgis/Quantum-GIS
Fix #7927 : Add a warning message if trying to print a composition
as an image fails (Qt's QImage sanity check for memory overflow)
Moved previous commit/pull request from core/qgscomposition to
apps/qgscomposer as QGIS server uses qgscomposition.