Larger Travis Screenshots

cmake/travis_after_success_linux.sh

 echo "set datadir \"../../data\"" >> OpenRaider.ini
 echo "set font \"../../data/test.ttf\"" >> OpenRaider.ini
 
-xvfb-run -n 99 -s "-screen 0 640x480x24" ./OpenRaider &
+xvfb-run -n 99 -s "-screen 0 1280x1024x24" ./OpenRaider &
 
 # Wait for OpenRaider to start
 wget http://imgur.com/tools/imgurbash.sh