MBS-6611, filesize.js has some strange defaults, provide a wrapper in MB.utility to configure it.
MBS-6611, add comment explaining arguments in filesize call.
Merge branch 'mbs-6611' into beta

* mbs-6611:
  MBS-6611, add comment explaining arguments in filesize call.
  MBS-6611, filesize.js has some strange defaults, provide a wrapper in MB.utility to configure it.