add failsafe display mode and isUsingFailsafeDisplay() methods for LWJGL
add semicolon
remove isUsingFailsafeDisplay method from Graphics interface
Merge remote-tracking branch 'upstream/master' into failed-display
Merge branch 'master' into failed-display
use callback for display mode creation failure
Merge pull request #2149 from jrenner/failed-display

handle display creation failure for LWJGL