Adding Flowplayer 5.4.4

Source: http://flowplayer.org/
Github: https://github.com/flowplayer/flowplayer

Javascript and CSS files already min’d in release .zip.
Added maintainers in ascending alphabetical order of surname.

Doesn’t strictly meet the 100 watchers criteria, but has 455 stars and
146 forks.
Merge pull request #2252 from petecooper/master

Adding Flowplayer 5.4.4