Minor adjustments

Merge remote-tracking branch 'origin/master'

Update README.md

Artemis r5

Added support for 4.76 CEX/DEX and 4.78 CEX/DEX (thanks @Ps3itaTeam)
Updated code database to Bungholio's April 28th, 2016 update (thanks)

Artemis packages will now be held in the releases tab of the GitHub
repository.

Checks turnoff flag

Artemis r3

Fixed end of codelist crash (PRX)
Uses memory container instead of malloc (PRX)
Can be unloaded (PRX)
Loads PRX correctly on Start (GUI)
Updated MAMBA (4.60D, 4.70D, 4.75, 4.75D, 4.76, 4.76D)

Artemis r2

Added prebuilt list into pkg
Fixed start crashing the PS3
Added somewhat faster cheats loading
Added Berion's new GUI (incomplete)
Fixed Artemis unloading itself when a game is exited
Fixed the notification popup not displaying
Changed activation button to Start from L3+R3

Fixed file_exists() and dir_exists() bug