Allow Sass::Plugin#dwell to be nil to indicate no delay.
Allow Sass::Plugin#dwell to be nil to indicate no delay.

dylannnn/sass,Iamronan/sass,oss-practice/sass,Andrey-Pavlov/sass,nicklima/sass,saper/sass,MetaAshley/sass,antonifs/sass,jaroot32/sass,hcatlin/sass,Nzaga/sass,zaru/sass,ridixcr/sass,Anshdesire/sass,tangposmarvin/sass,Industrys/sass,zaru/sass,chriseppstein/sass,cmpereirasi/sass,rammy7219/sass,Andrey-Pavlov/sass,StephanieMak/sass,OrenBochman/sass,nickg33/sass,Galactix/sass,modulexcite/sass,Ahnita/sass,xzyfer/sass,modulexcite/sass,amitsuroliya/sass,MetaAshley/sass,jaroot32/sass,lmetla/sass,liquidmetal/sass,hcatlin/sass,PMArtz92/sass,HugoRLopes/sass,baiyanghese/sass,srinivashappy/sass,briangonzalez/sass,stewx/sass,askl56/sass,DanteKaris/sass,Nzaga/sass,Ahnita/sass,antonifs/sass,danielfein/sass,liquidmetal/sass,Galactix/sass,lmetla/sass,xzyfer/sass,danielfein/sass,saper/sass,tenderlove/sass,Industrys/sass,srinivashappy/sass,OrenBochman/sass,schneems/sass,cmpereirasi/sass,rammy7219/sass,HugoRLopes/sass,StephanieMak/sass,askl56/sass,amitsuroliya/sass,nickg33/sass,Anshdesire/sass,dylannnn/sass,ridixcr/sass,srawlins/sass,stewx/sass,srawlins/sass,JuanitoFatas/sass,14113/sass,Iamronan/sass,PMArtz92/sass,DanteKaris/sass,JuanitoFatas/sass,schneems/sass,tangposmarvin/sass,nicklima/sass