Move tunnel methods into PsiturkNetworkShell class
Move tunnel methods into PsiturkNetworkShell class

rbtrace/psiTurk,andyh616/psiTurk,rbtrace/psiTurk,pfeyz/psiTurk,mshvartsman/psiTurk,mshvartsman/psiTurk,kachergis/psiTurk,mshvartsman/psiTurk,berkeley-cocosci/psiTurk,pfeyz/psiTurk,NYUCCL/psiTurk,suchow/psiTurk,rbtrace/psiTurk,NYUCCL/psiTurk,berkeley-cocosci/psiTurk,suchow/psiTurk,andyh616/psiTurk,andyh616/psiTurk,pfeyz/psiTurk,NYUCCL/psiTurk,kachergis/psiTurk,michaelpacer/psiTurk,michaelpacer/psiTurk,berkeley-cocosci/psiTurk,michaelpacer/psiTurk,suchow/psiTurk,kachergis/psiTurk