Add control class.

models/control.rb

@@ -0,0 +1,25 @@
+require './models/mpd_connection'
+
+class Control
+  class << self
+    def play
+      MPDConnection.mpd.play
+    end
+
+    def stop
+      MPDConnection.mpd.stop
+    end
+
+    def next
+      MPDConnection.mpd.next
+    end
+
+    def previous
+      MPDConnection.mpd.previous
+    end
+
+    def pause
+      MPDConnection.mpd.pause(!MPDConnection.mpd.paused?)
+    end
+  end
+end

mpd_client.rb

@@ -5,6 +5,7 @@ Bundler.require(:default, ENV['RACK_ENV'])
 require 'json'
 require 'cgi'
 
+require './models/control'
 require './models/album'
 require './models/artist'
 require './models/song'

spec/models/control_spec.rb

@@ -0,0 +1,4 @@
+require 'spec_helper'
+
+describe Control do
+end