[glide] Add new extractor

Added an extractor for glide.me shared messages.  Glide is a movile video messaging services.  You can share the link to the messages easily enough and this would allow you to download and save the actual video.
added "bild.de" as extractor
[crunchyroll] Correct parsing (Fixes #4014)
Add --flat-playlist option (Closes #4003)
release 2014.10.24
Merge remote-tracking branch 'capital-G/master'
[bild] Simplify (#3983)
Credit @capital-G for bild.de (#3983)
vidzi Add new extractor
[vidzi] Correct order in imports (#3989)
[vidzi] Simplify
[vidzi] Use proper test case and simplify (#3989)
Merge remote-tracking branch 'thornomad/glide'
Credit @thornomad for glide (#3944)
[glide] Simplify
[YoutubeDL] Do not apply playlist info to videos when extract_flat is set (#4003)
Fix motherless test 0

Apparently motherless no longer serves flv for that video (or maybe even
other videos). So I changed expected extension from flv to mp4 and
changed expected md5 accordingly.
Add another motherless test

This test is for videos posted in groups.
URL looks like this:
motherless.com/g/group_name/ID
which is basically the same as
motherless.com/ID
So far this test fails because I haven't improved the extractor yet.
Add group videos support for motherless

Modified motherless regular expression.
Previously it matched only URLs like this:
motherless.com/ID
Now it also matches this:
motherless.com/g/group_name/ID
All tests including the newly added one passed.
[motherless] Simplify