Allow #capture_haml to work with blocks from other templates.
Allow #capture_haml to work with blocks from other templates.

We won't need this if we switch to having blocks return strings.

tangposmarvin/haml,xzyfer/sass,tenderlove/sass,Iamronan/sass,modulexcite/sass,tangposmarvin/haml,baiyanghese/sass,zaru/sass,OrenBochman/sass,liquidmetal/sass,sideci-sample/sideci-sample-haml,nickg33/sass,amatsuda/haml,srawlins/sass,HugoRLopes/sass,antonifs/sass,DanteKaris/sass,hcatlin/sass,Nzaga/sass,antonifs/sass,14113/sass,JuanitoFatas/sass,briangonzalez/sass,stewx/sass,amitsuroliya/sass,cmpereirasi/sass,JuanitoFatas/sass,Nzaga/sass,haml/haml,schneems/sass,nazar-pc/haml,OrenBochman/sass,haml/haml,Iamronan/sass,tangposmarvin/sass,lmetla/sass,askl56/sass,oss-practice/sass,macressler/haml,nicklima/sass,chriseppstein/haml,keithpitty/haml,srawlins/sass,nickg33/sass,HugoRLopes/sass,Ahnita/sass,concord-consortium/haml,Ahnita/sass,PMArtz92/sass,liquidmetal/sass,MetaAshley/sass,Industrys/sass,rammy7219/sass,nicklima/sass,stanhu/haml,danielfein/sass,stewx/sass,nazar-pc/haml,Andrey-Pavlov/sass,Anshdesire/sass,StephanieMak/sass,StephanieMak/sass,askl56/sass,haml/haml,stanhu/haml,danielfein/sass,ridixcr/sass,dylannnn/sass,tangposmarvin/sass,schneems/sass,zaru/sass,rammy7219/sass,modulexcite/sass,purcell/haml,chriseppstein/sass,Andrey-Pavlov/sass,srinivashappy/sass,uniba/hamldoc_ja,chriseppstein/haml,PMArtz92/sass,dg1dd1ngs/haml,saper/sass,srinivashappy/sass,dylannnn/sass,macressler/haml,keithpitty/haml,lmetla/sass,dg1dd1ngs/haml,Galactix/sass,jaroot32/sass,DanteKaris/sass,saper/sass,Industrys/sass,ridixcr/sass,haml/haml,Galactix/sass,hcatlin/sass,Anshdesire/sass,amitsuroliya/sass,MetaAshley/sass,vio/haml,xzyfer/sass,cmpereirasi/sass,jaroot32/sass,stefanpenner/haml