To avoid confusion about where these files come from, add a header
comment upon preprocessing that warns people to not modify the
generated files directly, and points them to the appropriate
template file.
Rather than directly invoke command-line Python (and Mako) from the
assets Rakefile, or call an external Python script, use a Django
management command to preprocess all asset template files.
An "asset template file" is defined as a static asset file with a
file extension indicating that it needs to be run through a template
engine prior to Sass/CoffeeScript compilation or packaging with other
assets. The preprocess_assets management command will look through
all of the files listed in the `STATICFILES_DIRS`, preprocessing each
as needed. Preprocessing strips off the special template file
extension, creating a new file in the process.
Currently, the only variable accessible in an asset template file is
the `THEME_NAME`, defined in the settings.
