Gallery version 2.5.1: fix for moviepy

moviepy was forcing a download of ffmpeg that was 404ing. This release
includes the ffmpeg binary in the container and directs moviepy to use
that binary

Author: mxmeinhold

setup.cfg

@@ -6,7 +6,7 @@ summary = Python Photo Gallery Written in Flask
 url = "https://github.com/ComputerScienceHouse/gallery"
 description-file = README.md
 license = MIT
-version = 2.5.0
+version = 2.5.1
 classifier =
     Natural Language :: English
     Operating System :: POSIX :: Linux