Some work done on ffmpeg audio module.

modified:   config/initializers/custom_configs.rb
modified:   lib/modules/audio.rb
modified:   lib/modules/audio_ffmpeg.rb
modified:   lib/modules/audio_sox.rb
modified:   spec/models/module_audio_spec.rb
modified:   spec/spec_helper.rb
Merge branch 'master' of https://github.com/QutBioacousticsResearchGroup/bioacoustic-workbench
Audio conversion and segmenting now pretty much done, and tested.

modified:   lib/modules/audio.rb
modified:   lib/modules/audio_ffmpeg.rb
modified:   lib/modules/audio_mp3splt.rb
modified:   lib/modules/audio_sox.rb
modified:   lib/modules/audio_wavpack.rb
modified:   lib/modules/file_cacher.rb
renamed:    spec/models/module_audio_test.rb -> spec/models/module_audio_spec.rb
modified:   spec/spec_helper.rb
modified:   spec/support/devise.rb
modified:   spec/support/helpers.rb
new file:   test/fixtures/audio/06Sibylla.asf
new file:   test/fixtures/audio/06Sibylla.wma