Domain blocks now have varying severity - auto-suspend vs auto-silence

db/migrate/20170123162658_add_severity_to_domain_blocks.rb

@@ -0,0 +1,5 @@
+class AddSeverityToDomainBlocks < ActiveRecord::Migration[5.0]
+  def change
+    add_column :domain_blocks, :severity, :integer, default: 0
+  end
+end