Added conf.secondary_sources.x0 = [] for repeated plotting of box shaped array
Fixed headphone compensation path in SFS_config_example
Added label to the frequency response plots

Note the plots have to be redone with Matlab for the README
Merge branch 'master' of github.com:sfstoolbox/sfs

* 'master' of github.com:sfstoolbox/sfs:
  Fixed rotation of box shaped array