Add basic playlists management

* Index of playlists
* Create a new playlist
* Basic playlist model with mandatory name

spec/views/playlists/index.html.haml_spec.rb

@@ -0,0 +1,22 @@
+require 'spec_helper'
+
+describe 'playlists/index.html.haml' do
+  before do
+    assign :playlists, [
+      double('Playlist', :name => 'Foo'),
+      double('Playlist', :name => 'Bar')
+    ]
+  end
+
+  it 'displays a list of playlists' do
+    render
+    rendered.should have_selector('ul>li', :count => 2)
+    rendered.should have_selector('ul>li', :text => 'Foo')
+    rendered.should have_selector('ul>li+li', :text => 'Bar')
+  end
+
+  it 'displays a link to create a new playlist' do
+    render
+    rendered.should have_selector('a', :text => 'Create playlist')
+  end
+end

spec/views/playlists/new.html.haml_spec.rb

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+require 'spec_helper'
+
+describe 'playlists/new.html.haml' do
+  let(:playlist) do
+    mock_model('Playlist').as_new_record.as_null_object
+  end
+
+  before do
+    assign :playlist, playlist
+  end
+
+  it 'renders a form to create a playlist' do
+    render
+    rendered.should have_selector("form[method=post][action='#{playlists_path}']")
+    rendered.should have_selector('input[type=submit]')
+  end
+
+  it 'renders a text field with a label for the playlists name' do
+    playlist.stub(:name => 'Electro')
+    render
+    rendered.should \
+      have_selector("input[type=text][name='playlist[name]'][value=Electro]")
+    rendered.should \
+      have_selector("label[for=playlist_name]", :text => 'Name')
+  end
+end