Mute button progress so far. WIP, doesn't entirely work correctly.

db/migrate/20170301222600_create_mutes.rb

@@ -0,0 +1,12 @@
+class CreateMutes < ActiveRecord::Migration[5.0]
+  def change
+    create_table :mutes do |t|
+      t.integer :account_id, null: false
+      t.integer :target_account_id, null: false
+      t.timestamps null: false
+    end
+
+    add_index :mutes, [:account_id, :target_account_id], unique: true
+
+  end
+end