Adding in new models for sphinx and updating transcription service to ac...

The following changes were made:
  - Sphinx is successfully transcribing wav files
  - Successfully started Sphinx as a background service after the completion of the conversion to a wav file
  - SphinxTranscriptionService is successfully saving a text file to the external recordings directory.
  - Filebrowser is only showing the name (without extension) of the wav files. We can get the corresponding text files with the same name and extension .txt