Add ability to download files.

This happens through Sinatra right now, might change that.

broadcast.rb

@@ -23,6 +23,11 @@ class Broadcast < Sinatra::Base
     render_file_tree params[:dir] 
   end
 
+  get "/download" do
+    file = File.join MEDIA_DIR + params[:file]
+    send_file(file, :disposition => 'attachment', :filename => File.basename(file))
+  end
+
   get "/snapshot.jpg" do
     content_type 'image/png'
     capture_picture_data

test.rb

@@ -33,6 +33,11 @@ def test_get_location
     assert last_response.ok?
   end
 
+  def test_download
+    get '/download?file=/snapshots/latest.jpg'
+    assert last_response.ok?
+  end
+
   def test_tts
     post '/say.json'
     assert last_response.ok?