Listener enhancement
Revert sound behaviour
Removed unnecessary argument
Merge pull request #4 from gdumee/Listener-enhancement

Listener enhancement
- Manage PyWit exceptions
- The keyword received from the server, is used to choose the pocketsphinx dic and lm files to load
- Ability to laod a different hmm from configuration file ex: "hmm": "lium_french_f2"
- Minor improvements
- Stats on keyword spotting scores (max, min and moy)
- Added comments