[#770] Example of search box auto-fill on projects listing page

The actual search functionality has not been implemented yet, but an example of the search box can be seen on /projectsearch. Typeahead.js is used with a combination of local files (country and continents) and remote lookup (projects and organisations). Still need to:

- Test the performance on live database
- Clean up code (put javascript in seperate file)

akvo/rsr/models/project.py

@@ -222,7 +222,7 @@ def image_path(instance, file_name):
 
     @models.permalink
     def get_absolute_url(self):
-        return ('project_main', (), {'project_id': self.pk})
+        return ('project-main', (), {'project_id': self.pk})
 
     def all_donations(self):
         return Invoice.objects.filter(