increased comic file name lenght to 100 chars

fixed finding the file extension.

comic/migrations/0006_auto_20150625_1411.py

@@ -0,0 +1,24 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('comic', '0005_auto_20150625_1400'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='comicstatus',
+            name='last_read_page',
+            field=models.IntegerField(default=0),
+        ),
+        migrations.AlterField(
+            model_name='comicstatus',
+            name='unread',
+            field=models.BooleanField(default=True),
+        ),
+    ]