用Xcode新建Kobold2D项目时，报错：
int newSize = [(SingleFileDownloader*)[_sizeCheckers objectAtIndex: _curFile] contentLength];
Multiple methods named ‘contentLength’
解决方法，打开终端，输入：
curl https://s3.amazonaws.com/mgwu-misc/xcode5-kobold.sh | sh
用Xcode新建Kobold2D项目时，报错：
int newSize = [(SingleFileDownloader*)[_sizeCheckers objectAtIndex: _curFile] contentLength];
Multiple methods named ‘contentLength’
解决方法，打开终端，输入：
curl https://s3.amazonaws.com/mgwu-misc/xcode5-kobold.sh | sh