volume: Now uses amixer + various enhancements
volume: Now uses amixer + various enhancements

 * Script header closer to other crouton scripts
 * Parameter handling through case
 * Printing help and error message to stderr on error

elkangaroo/chroagh,elkangaroo/chroagh,elkangaroo/chroagh,elkangaroo/chroagh,elkangaroo/chroagh,elkangaroo/chroagh