updated filemidi to also take a filename

lib/midi/file_output/file_midi.rb

@@ -1,6 +1,8 @@
 class FileMIDI
-  attr_accessor :clock
-  def initialize(clock)
-    @clock = clock
+  attr_accessor :clock, :filename
+  def initialize(options)
+    raise :hell unless options.is_a? Hash
+    @clock = options[:clock]
+    @filename = options[:filename]
   end
 end

spec/midi_files_spec.rb

@@ -1,8 +1,10 @@
 require 'lib/archaeopteryx'
 
 describe FileMIDI do
-  it "requires a clock" do
-    FileMIDI.new(Clock.new(170)).should be_an_instance_of FileMIDI
+  it "requires options: a clock and a filename" do
+    FileMIDI.new(:clock => Clock.new(170),
+                 :filename => "foo.mid").should be_an_instance_of FileMIDI
     L{FileMIDI.new}.should raise_error
+    L{FileMIDI.new("asdf")}.should raise_error
   end
 end