Added QtCreator project for Linux and Windows (windows port isn't
finished).

Also:
1. Fixed install_glfw.sh script to avoid conflict with glfw2 installed
with package manager.
2. Added MinGW compiler support.
support qt mingw32'
Cleanup qmake configuration, updated for latest upstream changes.
QtCreator: fixed building&running on windows/MinGW.
fix SimpleGame main.cpp include
Fixed coding style issues for previous MinGW tweaks.
Merge pull request #1 from sergey-shambir/qtcreator

Fixed coding style issues for previous MinGW tweaks.
fix MinGW audio play
Merge pull request #3 from akof1314/qtcreator

Now MinGW can support audio
Merge remote-tracking branch 'sergey/qtcreator' into mingwBuild

Conflicts:
	cocos/2d/platform/win32/CCStdC.h
	cocos/audio/win32/MciPlayer.cpp
	cocos/base/CCPlatformConfig.h
	external/glfw3/prebuilt/win32/libglfw3.a
Fix Qt Creator build for Cocos2d-x