Record API SSO status (#568)

Added sso_verified flag to EveApiKeyPair
Set sso_verified flag when user validates API key
Allow users to SSO validate existing API keys

eveonline/migrations/0004_eveapikeypair_sso_verified.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.2 on 2016-11-01 04:20
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('eveonline', '0003_auto_20161026_0149'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='eveapikeypair',
+            name='sso_verified',
+            field=models.BooleanField(default=False),
+        ),
+    ]