add failsafe display mode and isUsingFailsafeDisplay() methods for LWJGL
add semicolon
remove isUsingFailsafeDisplay method from Graphics interface
Made the map implementations Java 8 compliant.
NateS solution for ObjectMap and IdentityMap.
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
Added premultiplied alpha to particle emitter and particle editor.
Updated changes.
Merge pull request #2184 from ollipekka/premult_alpha

Premultiplied alpha for 2d particle effects
Merge pull request #2183 from GreenLightning/master

Scene2d: Add positionChanged() method to Actor.
Merge pull request #2157 from nooone/java8

Made the map implementations Java 8 compliant.
Add mappings for Xbox 360 controller.