Added flat pages for entrance and special flatpage redirects.

Enetrances should probably store their urls like cavers.  Maybe the flatpages should be handled by the app Aaron installed.

flatpages/models.py

@@ -1,3 +1,12 @@
 from django.db import models
+from core.models import Cave, Entrance
 
-# Create your models here.
+class Redirect(models.Model):
+    originalURL = models.CharField(max_length=200, unique=True)
+    newURL = models.CharField(max_length=200)
+
+class EntranceRedirect(models.Model):
+    originalURL = models.CharField(max_length=200)
+    entrance = models.ForeignKey(Entrance)
+    def __unicode__(self):
+        return self.entrance.slug