Facebook Integration for Sahana Eden

We had to make Facebook Login and Like functionality work in the Sahana Eden page. To achieve this task, the changes we made were:

1. We registered ourselves as a Facebook developer and created an application, which provided us with an application ID and secret key.

2. In the config.py file, we added this ID and key to the "settings.auth.facebook_id" and "settings.auth.facebook_secret".

This activated the Facebook Login and like functionality.