[CinemassacreIE] Fix information extraction
Merge pull request #1632 from rzhxeo/cinemassacre

[Cinemassacre] Download video that is shown in flash player
[cinemassacre] Simplify

* Remove some rtmp parameters that are not needed.
* Remove the md5 checksums, the video is not downloaded.
* Remove the code used before the current format system.