Add ability to approve/reject workers by HIT
Add ability to approve/reject workers by HIT

Use 'worker approve --hit <hit_id>' to approve all workers in a specific hit.

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