Add partially complete changelog. Goes toward #2.
Use `MediaFileForeignKey` for `VideoSectionContent`.

Breaks FeinCMS < 1.7 compatibility.
Drop legacy support hacks.
Remove django 1.3 support.
Whit espace.
Bump version to 1.0.0
Code standards.
Import order.
Merge pull request #6 from incuna/fein-1.7-fix

Fein 1.7 fix