Implement actual file download.
Run this rake task when migrating from old installs without a materials folder.
When creating a new course, make sure that we create the root materials folder as well.
Merge branch 'materials' of github.com:fuzzie360/coursemology.org into materials
Partially revert 5c8d3027ccac7bb85c652c3051f80da19b186d57 to remove the need to explicitly specify form parameters.
{artially revert 5c8d3027ccac7bb85c652c3051f80da19b186d57 to remove the need to explicitly specify form parameters.