Implement track/stream

* Add Streamer class
* Use FactoryGirl for factories
* Add sha256 field to tracks
* Add mime_type field to tracks

db/migrate/20110725110405_add_mime_type_field_to_tracks.rb

@@ -0,0 +1,9 @@
+class AddMimeTypeFieldToTracks < ActiveRecord::Migration
+  def self.up
+    add_column :tracks, :mime_type, :string
+  end
+
+  def self.down
+    remove_column :tracks, :mime_type
+  end
+end

db/migrate/20110726101228_add_sha256_field_to_tracks.rb

@@ -0,0 +1,9 @@
+class AddSha256FieldToTracks < ActiveRecord::Migration
+  def self.up
+    add_column :tracks, :sha256, :string
+  end
+
+  def self.down
+    remove_column :tracks, :sha256
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20110713182005) do
+ActiveRecord::Schema.define(:version => 20110726101228) do
 
   create_table "playlists", :force => true do |t|
     t.string   "name"
@@ -22,6 +22,8 @@ ActiveRecord::Schema.define(:version => 20110713182005) do
     t.string   "name"
     t.datetime "created_at"
     t.datetime "updated_at"
+    t.string   "mime_type"
+    t.string   "sha256"
   end
 
 end