Feature: User API key support (server side implementation)

- Supports throttled read and write
- No support for push yet, but data is captured about intent

db/migrate/20160815002002_add_user_api_keys.rb

@@ -0,0 +1,19 @@
+class AddUserApiKeys < ActiveRecord::Migration
+  def change
+    create_table :user_api_keys do |t|
+      t.integer :user_id, null: false
+      t.string :client_id, null: false
+      t.string :key, null: false
+      t.string :application_name, null: false
+      t.boolean :read, null: false
+      t.boolean :write, null: false
+      t.boolean :push, null: false
+      t.string :push_url
+      t.timestamps
+    end
+
+    add_index :user_api_keys, [:key], unique: true
+    add_index :user_api_keys, [:user_id]
+    add_index :user_api_keys, [:client_id]
+  end
+end