FEATURE: civilized mute

Allow user to mute all notifications generated by specific users

db/migrate/20150323234856_add_muted_users.rb

@@ -0,0 +1,12 @@
+class AddMutedUsers < ActiveRecord::Migration
+  def change
+    create_table :muted_users do |t|
+      t.integer :user_id, null: false
+      t.integer :muted_user_id, null: false
+      t.timestamps
+    end
+
+    add_index :muted_users, [:user_id, :muted_user_id], unique: true
+    add_index :muted_users, [:muted_user_id, :user_id], unique: true
+  end
+end