Add audio track requested on body response

$ wget http://localhost:8080/tmp/segment.aac && mediainfo segment.aac
2013-05-03 11:53:45 (484 MB/s) - `segment.aac' saved [31969/31969]
General
Complete name                    : segment.aac
Format                           : ADTS
Format/Info                      : Audio Data Transport Stream
File size                        : 31.2 KiB
Duration                         : 8s 603ms
Overall bit rate                 : 29.7 Kbps

Audio
Format                           : AAC
Format/Info                      : Advanced Audio Codec
Format version                   : Version 4
Format profile                   : HE-AAC / LC
Duration                         : 8s 602ms
Bit rate mode                    : Constant
Bit rate                         : 29.7 Kbps
Channel(s)                       : 2 channels
Channel positions                : Front: L R
Sampling rate                    : 22.05 KHz / 11.025 KHz
Compression mode                 : Lossy
Stream size                      : 31.2 KiB (100%)
Add metadata files of the project
Remove audio_extractor code snippet
Add nginx sample conf
Remove memory leak and change realloc() to av_realloc()
Fix the way input_format_context is deallocated