fix script/canvas_update to work with brandable_css
fix script/canvas_update to work with brandable_css

we no longer use `npm run compile-sass` to do css.

also, css must happen before handlebars.

besides, all the js, css, styleguide and docs stuff
is handled by rake canvas:compile_assets already.
and in a way that whatever can run concurrently, 
will. 
(although, admittedly, the syntax to pass arguments 
to a rake task, e.g.: [0,0,1,0] is pretty lame)

Change-Id: I83c8ceb21b476456f47f3ec37d4ba6088ca68088
Reviewed-on: https://gerrit.instructure.com/57768
Reviewed-by: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
Product-Review: Ryan Shaw <ea3cd978650417470535f3a4725b6b5042a6ab59@instructure.com>
QA-Review: Ryan Shaw <ea3cd978650417470535f3a4725b6b5042a6ab59@instructure.com>
Tested-by: Jenkins

snehakachroo1/LSI_replica,Jyaasa/canvas-lms,sdeleon28/canvas-lms,antoniuslin/canvas-lms,AndranikMarkosyan/lms,HotChalk/canvas-lms,instructure/canvas-lms,djbender/canvas-lms,HotChalk/canvas-lms,dgynn/canvas-lms,kyroskoh/canvas-lms,jay3126/canvas-lms,snehakachroo1/LSI_replica,sfu/canvas-lms,Jyaasa/canvas-lms,roxolan/canvas-lms,sfu/canvas-lms,venturehive/canvas-lms,instructure/canvas-lms,antoniuslin/canvas-lms,djbender/canvas-lms,venturehive/canvas-lms,matematikk-mooc/canvas-lms,narigone/canvas,grahamb/canvas-lms,AndranikMarkosyan/lms,roxolan/canvas-lms,Rvor/canvas-lms,grahamb/canvas-lms,juoni/canvas-lms,Jyaasa/canvas-lms,dgynn/canvas-lms,Rvor/canvas-lms,kyroskoh/canvas-lms,matematikk-mooc/canvas-lms,kyroskoh/canvas-lms,redconfetti/canvas-lms,narigone/canvas,Jyaasa/canvas-lms,SwinburneOnline/canvas-lms,efrj/canvas-lms,greyhwndz/canvas-lms,HotChalk/canvas-lms,dgynn/canvas-lms,fronteerio/canvas-lms,instructure/canvas-lms,antoniuslin/canvas-lms,matematikk-mooc/canvas-lms,jay3126/canvas-lms,antoniuslin/canvas-lms,utkarshx/canvas-lms,greyhwndz/canvas-lms,instructure/canvas-lms,leftplusrightllc/canvas-lms,eCNAP/CANVAS,venturehive/canvas-lms,grahamb/canvas-lms,kyroskoh/canvas-lms,roxolan/canvas-lms,tgroshon/canvas-lms,instructure/canvas-lms,SwinburneOnline/canvas-lms,greyhwndz/canvas-lms,eCNAP/CANVAS,sdeleon28/canvas-lms,efrj/canvas-lms,grahamb/canvas-lms,Rvor/canvas-lms,skmezanul/canvas-lms,juoni/canvas-lms,efrj/canvas-lms,SwinburneOnline/canvas-lms,whalejasmine/canvas-lms,redconfetti/canvas-lms,AndranikMarkosyan/lms,sfu/canvas-lms,tgroshon/canvas-lms,skmezanul/canvas-lms,eCNAP/CANVAS,HotChalk/canvas-lms,efrj/canvas-lms,tgroshon/canvas-lms,venturehive/canvas-lms,utkarshx/canvas-lms,snehakachroo1/LSI_replica,narigone/canvas,skmezanul/canvas-lms,sfu/canvas-lms,sdeleon28/canvas-lms,redconfetti/canvas-lms,fronteerio/canvas-lms,leftplusrightllc/canvas-lms,AndranikMarkosyan/lms,jay3126/canvas-lms,jay3126/canvas-lms,dgynn/canvas-lms,greyhwndz/canvas-lms,leftplusrightllc/canvas-lms,matematikk-mooc/canvas-lms,skmezanul/canvas-lms,grahamb/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,narigone/canvas,utkarshx/canvas-lms,sfu/canvas-lms,utkarshx/canvas-lms,sdeleon28/canvas-lms,djbender/canvas-lms,djbender/canvas-lms,juoni/canvas-lms,whalejasmine/canvas-lms,snehakachroo1/LSI_replica,SwinburneOnline/canvas-lms,redconfetti/canvas-lms,leftplusrightllc/canvas-lms,fronteerio/canvas-lms,instructure/canvas-lms,whalejasmine/canvas-lms,Rvor/canvas-lms,roxolan/canvas-lms,juoni/canvas-lms,tgroshon/canvas-lms,eCNAP/CANVAS,fronteerio/canvas-lms,whalejasmine/canvas-lms