{% insert_file %} tag can now handle template variables using the inbuilt django variable resolution system
project specific css is now read from file in project data folder (dropbox
folder) instead of being included in /static. This means you can now
easily edit css. Now using the comicsite.skin parameter to hold the css
file filename. refs #162
if no css file is given for this project, do not try to include. #refs 162