add like objective-C manager file
chang Frame Packet to new memory management
change same example to memory management
fix same test for new memory management
avio.go change to new memory management
change cdoec.go to new memory management.
change codeCtx.go to new management
change FmtCtx@format.go to new memory managerment
change imgutils.go to new memory management
change some file to new memory management
NewDecoder() change to  FindDecoder()
NewEncoder() change to FindEncoder()
change stream.go to new memory management
change all file to new memory management
change video  video-to-jpeg.go  video-to-jpeg-p.go to new memory management
fix video-to-jpeg-p.go bug
Merge pull request #10 from daozhao/likeObjectiveCManager

Like objective c manager