1. Introduction

    Deal with difference of C std library, C++ std library, libxml2 and other 3rd-party libraries among each platform.
    Provide some functions which cocos2d-x used.

2. Release Note

    a. Rename CCX_PLATFORM_IPHONE to CCX_PLATFORM_IOS

3. Todo

    a. Remove macro CCX_PLATFORM_MOBILE and CCX_PLATFORM_PC