Direct screenwavemedia.com URLs support (issue #3766)

The first patch adds support for direct downloading from screenwavemedia.com URLs (by modifying the cinemassacre extractor). The second adds teamfourstar.com support on top of it.

**Warning**: the patches were not tested very well, and probably should not be accepted without review; I feel the code is quite inefficient with its multiple URL parsing and may not cover some corner cases.
youtube-dl already contains faciliities to handle embedded videos. Have a look at the 'url' type documented in [extractor/common.py](https://github.com/rg3/youtube-dl/blob/f58766ce5cc5a1c6d651560591bad119787e94b2/youtube_dl/extractor/common.py#L174)