Enable image uploads

Bedework has long allowed calendar managers to "attach" an image to an event by supplying a URL to an image.   Now calendar managers may upload an image to Bedework and "attach" to an event.

To enable this feature for a calendar suite:

1. Create an image repository (folder) inside Bedework
   1. Open the admin client.
   2. Visit the Systems tab.
   3. Click on Manage Calendars and Folders.
   4. Create a folder under Public.  Let's call it images.
2. In the calendar suite preferences, add the path to that folder
1. Visit the Calendar Suite tab.
2. Click on Manage preferences.
3. Fill in Default image directory with, in our example, /public/images.