admin: Lots of fixes for running the admin panel in a WSGI server. - Use new source APIs in the dashboard to open WIP files. - Fixed broken/outdated code in some views. - Fixed cases when Flask is not running at the root URL by using the `SCRIPT_NAME` variable somewhat more properly.

import os
from invoke import task, run


@task
def genmessages():
    root_dir = 'garcon/messages'
    out_dir = 'piecrust/resources/messages'
    run('python chef.py --root %s bake -o %s' % (root_dir, out_dir))
    os.unlink('piecrust/resources/messages/index.html')