Added a custom tag to display a link to a profile. Refactored the avatar tag to optionally display a profile link around the image. Removed the width and height attributes from the avatar image tag. I think this was causing disk hits whenever those properties were not cached. The avatar tag is now an inclusion tag.

"""
This file contains the admin definitions for the donations application.
"""
from django.contrib import admin
from donations.models import Donation

class DonationAdmin(admin.ModelAdmin):
    raw_id_fields = ('user', )

admin.site.register(Donation, DonationAdmin)