Update to rails 3.1.0

* Bump rails version to 3.1.0 in Gemfile
* Update config files
* Fix bcrypt monkey patch for specs
* Fix TracksController
* Replace track streaming with track download
* Remove assets from application layout

app/views/layouts/application.html.haml

@@ -3,8 +3,6 @@
   %head
     %meta{'charset' => 'utf-8'}
     %title scube
-    = stylesheet_link_tag :all
-    = javascript_include_tag :defaults
     = csrf_meta_tag
   %body
     = yield

app/views/tracks/show.html.haml

@@ -1,3 +1,3 @@
 %h1= @track.name
-%audio{:src => stream_track_path(@track), :controls => true, :autoplay => true}
+%audio{:src => download_track_path(@track), :controls => true, :autoplay => true}
   Your browser does not support the audio element