Little problem in spk_det.sh script.

**[GSoC2015 / Speaker_Dia_RedHen / ALIZE_spk_seg / spk_det.sh](https://github.com/RedHenLab/Audio/blob/master/GSoC2015/Speaker_Dia_RedHen/ALIZE_spk_seg/spk_det.sh)**
It seems that some initial part of the script is missing. This may be because of some accidental deletion. 