Optimization and get width and height

1. change map<std::string, TInfo> on unordered_map<unsigned int, TInfo> for speeding json parse.
2. fixes crash when reload texture with alpha.
3. change  reloadTexture(const char* fileName) to reload Texture(const char* fileName, unsigned int &imageWidth, unsigned int &imageHeight) for getting texture width and height.
4. add set CCDirector winsize just for cocostudio.