Added a possible_mentors property to the StudentProposal. Also set the name and [min,max] score for the RankList. Patch by: Lennard de Rijk Reviewed by: to-be-reviewed

# Geo-enabled Sitemap classes.
from django.contrib.gis.sitemaps.georss import GeoRSSSitemap
from django.contrib.gis.sitemaps.kml import KMLSitemap, KMZSitemap