comediansincarsgettingcoffee.com support (#2136)

This should resolve #2136 at least partially.

**Note**: I have left a few comments in the source code with some minor metadata issues. I am also not sure if I got the test correctly.
In this case you could instead use the `pubDateTime` field to set the `timestamp`. `upload_date` would then be calculated from the timestamp. See [extractor/common.py](https://github.com/rg3/youtube-dl/blob/master/youtube_dl/extractor/common.py#L51) for more information.