Add CinemassacreIE
[CinemassacreIE] Add support for other embed methods
[CinemassacreIE] Remove docstring from class
[CinemassacreIE] Use MD5 to check in TEST description
Merge branch 'cinemassacre' of github.com:rzhxeo/youtube-dl into rzhxeo-cinemassacre
Merge pull request #1558 from rzhxeo/cinemassacre

Add support for http://cinemassacre.com
Now a new FileDownloader is created when downloading a video

The progress hooks can be added using the method "add_downloader_progress_hook"
Move FileDownloader to its own module and create a new class for each download process

A suitable downloader can be found using the 'get_suitable_downloader' function.

Each subclass implements 'real_download', for downloading an info dict you call the 'download' method, which first checks if the video has already been downloaded