Update Timer.cs

Simplified the TimerDIV method.
Update Timer.cs

Added Access Modifier
Update CPU.cs

Added access modifier and a little comment ;)
Update Disassembler.cs

Added access modifier
Update Audio.cs

Added access modifiers
Update Gameboy.cs

Added access modifiers
Update IMemoryDevice.cs

Added access modifiers
Update Joypad.cs

Added access modifier
Update MBC.cs

Added access modifiers
Update MemoryRouter.cs

Added access modifier
Update ROM.cs

Added access modifiers
Update Video.cs

Added access modifier
Merge pull request #3 from nafets3646/master

Stuff and Things