Changing Copyright Holder to WWU.

This is work done for Western Washington University (WWU) and hence
is copyrighted to WWU.
Creating script to convert a single m4a file.

m4a_to_aac.sh checking for avconv, single file argument, and file
existence before converting to an aac in the m4a file directory.
Adding script to recursively copy m4a to aac.
Created usage information in README
Adding aac to ogg scripts