Fixed background image name for retina
Update Mednafen submodule
Fix right stick in Playstation system plugin
Implement serialLookupForFile: for PSP system plugin
Add Wii U Pro controller to PSP automappings
Add analog support and Wii U Pro controller to PSX automappings
Merge pull request #1099 from dannyow/master

Fixed background image name for retina
Update PPSSPP submodule
Implement serialLookupForFile: for NDS system plugin
Add compressed ROM support for header and serial lookup during import