Fix errors in recording scripts.

Logger was apparently imported by the matterhorn stuff ?! so move that
to the main library.

Fix a variable reference in sanity.

record-and-playback/core/lib/recordandplayback.rb

@@ -36,6 +36,7 @@ require 'recordandplayback/generators/presentation'
 require 'open4'
 require 'pp'
 require 'absolute_time'
+require 'logger'
 
 module BigBlueButton
   class MissingDirectoryException < RuntimeError

record-and-playback/core/scripts/sanity/sanity.rb

@@ -44,7 +44,7 @@ def check_audio_files(raw_dir,meeting_id)
     	raise Exception,  "Audio file #{raw_audio_file} doesn't exist in raw directory." if not File.exists?(raw_audio_file)
 
     	#checking length
-        info = BigBlueButton::EDL::Audio.audio_info(filename)
+        info = BigBlueButton::EDL::Audio.audio_info(raw_audio_file)
         if info[:duration].nil? or info[:duration] == 0
           raise Exception, "Audio file #{raw_audio_file} length is zero."
         end