Added django==1.11 as version to requirements file (django 2.0 is not compatible with this version)
Added -strict -2 parameters to ffmpeg backend. Without this, method test_encode in test_proj/media_library/tests/test_ffmpeg_backend.py will fail with error message "video_encoding.exceptions.FFmpegError: File size of generated file is 0".
Coverage remained the same at 92.5% when pulling ce7db8a1517c7c641aab45740d15c453f7aab066 on goranpavlovic:master into 56f08a5af8fb5d66aab2982e769f56a648362dff on escaped:master.