A flv library.

v0.1.0

• Fix #20, clean up the remaing PPS data.

• Fix the error chain.

  v0.2.0

• Read audio and video codec information.

  v0.2.1

• Fix rtmp cts parse error.

  v0.3.0

• Reference bytesio v0.3.0.

• Do some refactoring for rtsp2rtmp.