fix facebook integration
fix facebook integration

facebook puts canvas in an iframe - we have to allow it to

test plan:
 * link your facebook account with canvas
 * go to canvas from facebook
 * it should not be blank

Change-Id: I1b5ecfbe121d2e519447daed9af5c86f52ffcc21
Reviewed-on: https://gerrit.instructure.com/16695
Reviewed-by: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
QA-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>

venturehive/canvas-lms,efrj/canvas-lms,tgroshon/canvas-lms,ShreniiNepal/shrenii_lmp,samuels410/greatlakes-lms,fronteerio/canvas-lms,juoni/canvas-lms,wrdsb/canvas-lms,redconfetti/canvas-lms,antoniuslin/canvas-lms,jay3126/canvas-lms,fronteerio/canvas-lms,grahamb/canvas-lms,kyroskoh/canvas-lms,arrivu/hoodemo,greyhwndz/canvas-lms,usmschuck/canvas,djbender/canvas-lms,nditech/red-innovadores-lms,leftplusrightllc/canvas-lms,wimemx/Canvas,tgroshon/canvas-lms,arrivu/jigsaw-lms,parbros/red-innovadores-lms,SwinburneOnline/canvas-lms,arrivu/jigsaw-lms,merichar/canvas-lms,jay3126/canvas-lms,va7map/canvas-lms,SwinburneOnline/canvas-lms,leftplusrightllc/canvas-lms,sfu/canvas-lms,tgroshon/canvas-lms,SwinburneOnline/canvas-lms,arrivu/arrivu-lms,skmezanul/canvas-lms,venturehive/canvas-lms,leftplusrightllc/canvas-lms,wimemx/Canvas,rup/Tarrax,arrivu/jigsaw-lms,parbros/red-innovadores-lms,HotChalk/canvas-lms,wye0220/shindig-canvas,arrivu/hoodemo,nditech/red-innovadores-lms,juoni/canvas-lms,arrivu/hoodemo,sdeleon28/canvas-lms,djbender/canvas-lms,loganrun/pincan,Jyaasa/canvas-lms,sdeleon28/canvas-lms,sdeleon28/canvas-lms,loganrun/pincan,whalejasmine/canvas-lms,HotChalk/canvas-lms,va7map/canvas-lms,HotChalk/canvas-lms,landonwilkins/canvas-lms,parbros/red-innovadores-lms,va7map/canvas-lms,arrivu/qibla-ecampus,shidao-fm/canvas-lms,landonwilkins/canvas-lms,greyhwndz/canvas-lms,kyroskoh/canvas-lms,grahamb/canvas-lms,shidao-fm/canvas-lms,fronteerio/canvas-lms,wye0220/shindig-canvas,merichar/canvas-lms,arrivu/arrivu-lms,greyhwndz/canvas-lms,wrdsb/canvas-lms,sfu/canvas-lms,Rvor/canvas-lms,Unow/ins,landonwilkins/canvas-lms,djbender/canvas-lms,roxolan/canvas-lms,sli7246/canvas_branch,usmschuck/canvas,grahamb/canvas-lms,juoni/canvas-lms,utkarshx/canvas-lms,juoni/canvas-lms,Unow/ins,venturehive/canvas-lms,wye0220/shindig-canvas,sfu/canvas-lms,wimemx/Canvas,Rvor/canvas-lms,arrivu/arrivu-lms,Unow/canvas-lms,sdeleon28/canvas-lms,wrdsb/canvas-lms,sli7246/canvas_branch,redconfetti/canvas-lms,skmezanul/canvas-lms,sfu/canvas-lms,samuels410/greatlakes-lms,leftplusrightllc/canvas-lms,sfu/canvas-lms,roxolan/canvas-lms,venturehive/canvas-lms,arrivu/qibla-ecampus,Unow/canvas-lms,shidao-fm/canvas-lms,ShreniiNepal/shrenii_lmp,rup/Tarrax,Unow/ins,antoniuslin/canvas-lms,nditech/red-innovadores-lms,grahamb/canvas-lms,kyroskoh/canvas-lms,ShreniiNepal/shrenii_lmp,jay3126/canvas-lms,landonwilkins/canvas-lms,usmschuck/canvas,tgroshon/canvas-lms,roxolan/canvas-lms,whalejasmine/canvas-lms,sli7246/canvas_branch,redconfetti/canvas-lms,Rvor/canvas-lms,Unow/canvas-lms,whalejasmine/canvas-lms,ShreniiNepal/shrenii_lmp,HotChalk/canvas-lms,kyroskoh/canvas-lms,fronteerio/canvas-lms,greyhwndz/canvas-lms,shidao-fm/canvas-lms,Jyaasa/canvas-lms,merichar/canvas-lms,grahamb/canvas-lms,antoniuslin/canvas-lms,va7map/canvas-lms,efrj/canvas-lms,loganrun/pincan,arrivu/qibla-ecampus,wrdsb/canvas-lms,efrj/canvas-lms,utkarshx/canvas-lms,Jyaasa/canvas-lms,samuels410/greatlakes-lms,rup/Tarrax,utkarshx/canvas-lms,usmschuck/canvas,sfu/canvas-lms,djbender/canvas-lms,antoniuslin/canvas-lms,efrj/canvas-lms,skmezanul/canvas-lms,sfu/canvas-lms,Rvor/canvas-lms,whalejasmine/canvas-lms,SwinburneOnline/canvas-lms,samuels410/greatlakes-lms,skmezanul/canvas-lms,redconfetti/canvas-lms,roxolan/canvas-lms,Jyaasa/canvas-lms,nditech/red-innovadores-lms,utkarshx/canvas-lms,jay3126/canvas-lms