SelectTask: Allow customizable decoder
SelectTask: Allow customizable decoder

Set the default from stdout.  This helps more of the unittests to pass
on py3k

fmoo/sparts,djipko/sparts,facebook/sparts,djipko/sparts,pshuff/sparts,fmoo/sparts,facebook/sparts,bboozzoo/sparts,bboozzoo/sparts,pshuff/sparts