Merge pull request #25 from libretro/master

Fixup logging interface/Set min OS version to 10.6
[Gamecube/Wii] added configurable NTSC filter
Merge branch 'master' of github.com:ekeeke/Genesis-Plus-GX
[Core/IO] added gamepad type auto-detection
[Core/IO] fixed TeamPlayer emulation (fixes multitap detection in Gauntlet 4)
[Core/IO] added homemade Master System multitap emulation (BOom)
[libretro] fixed core resolution changes detection
[Wii] added configurable Wiimote timeout
[libretro] added support for Master System homemade multitap
[Gamecube/Wii] added current builds to repository
[libretro] added current Win32 build to repository
added a few indications for downloads in README.md
[Gamecube/Wii] fixed graphical glitch in bottom border area when borders are disabled
Merge https://github.com/ekeeke/Genesis-Plus-GX