[Helpers] All lession audio up

[Gustaf Grefberg]

Ok I've converted all the remaining lessons to mp3 files. I've ran them all
through some processing with a bit of restoration, bringing back some of the
high frequencies that were lost in the real audio compression, and applied
some compressor/noise gate with makes it sound a bit cleaner. :)  

If you don't like it that way, I will make mp3s without any processing at
all and upload them again. Not done with it until you are happy with the
result. 

The files all have the same filenames as the original files, but with an
.mp3 extension instead of .rm

I was not able to convert the audio only files for some reason, but I was
able to strip the sound from the videos and turn those into mp3s.  As far as
I know, it's the same sound. 

Namaste!
Gustaf