New app "extsources"

Now we keep external hosts.txt sources in django.

web/extsources/models.py

@@ -0,0 +1,16 @@
+from django.db import models
+
+from web.lib.validation import validate_i2purl
+
+class ExternalSource(models.Model):
+	name = models.CharField(max_length=128, unique=True)
+	url = models.CharField(max_length=256, validators=[validate_i2purl])
+	description = models.CharField(max_length=512, blank=True)
+	last_modified = models.DateTimeField(null=True, blank=True)
+	last_success = models.DateTimeField(null=True, blank=True)
+	etag = models.CharField(max_length=256, blank=True)
+	active = models.BooleanField(default=True)
+
+	def __unicode__(self):
+		return self.name
+