Download changes

    - Remove redundant date column from File table
    - Adjust file ordering
Merge branch 'master' into release
Download Content Changes

    - Added Content field which is used to determine if the Release
      should be redirected to a legacy Page object or if the new
      DownloadReleaseDetail view should be used.
    - Adjusted Download related docs to match new behavior
Merge branch 'master' into release