[loose parser] Refine block-closing heuristics, add expression-continuing heuristics
[loose parser] Refine block-closing heuristics, add expression-continuing heuristics

MarcelGerber/acorn,mysticatea/acorn,happibum/acorn,btmills/acorn,hulkish/babel,babel/babylon,mathiasbynens/acorn,marcominetti/acorn-babel,chicoxyzzy/babel,mathiasbynens/acorn,btmills/acorn,babel/babel,kittens/acorn-jsx,shuhei/babel,mysticatea/acorn,hulkish/babel,Rich-Harris/acorn,RReverser/biscript,kaicataldo/babel,gratex/acorn,PolymerLabs/babel,differentmatt/filbert,kaicataldo/babel,xiemaisi/acorn,vadzim/babel,Rich-Harris/acorn,ajaxorg/acorn,RReverser/acorn-jsx,TimothyGu/acorn,kellyselden/babel,happibum/acorn,happibum/acorn,marijnh/acorn,existentialism/babel,ajaxorg/acorn,Skillupco/babel,luiseduardohdbackup/filbert,blai/acorn-jsx,marijnh/acorn,Rich-Harris/acorn,marcominetti/acorn-babel,jridgewell/babel,kittens/acorn-jsx,tonylukasavage/acorn,xiemaisi/acorn,jridgewell/babel,babel/babel,lightscript/babylon-lightscript,xiemaisi/acorn,shuhei/babel,btmills/acorn,MarcelGerber/acorn,hulkish/babel,kidaa/filbert,kellyselden/babel,chicoxyzzy/babel,ternjs/acorn,gratex/acorn,TimothyGu/acorn,samwgoldman/babel,jridgewell/babel,PolymerLabs/babel,kaicataldo/babel,mysticatea/acorn,samwgoldman/babel,benekastah/acorn,gratex/acorn,babel/babel,maurobringolf/babel,danez/babylon,kellyselden/babel,cbishopvelti/babylon,PolymerLabs/babel,samwgoldman/babel,jridgewell/babel,sebmck/acorn-jsx,guybedford/babel,ajaxorg/acorn,marijnh/acorn,Skillupco/babel,hulkish/babel,wcjohnson/babylon-lightscript,claudiopro/babel,claudiopro/babel,kidaa/filbert,mathiasbynens/acorn,TimothyGu/acorn,MarcelGerber/acorn,hzoo/babel,existentialism/babel,sebmck/acorn-jsx,guybedford/babel,samhou1988/acorn,samhou1988/acorn,babel/babel,recipesjs/ingredients,claudiopro/babel,Skillupco/babel,Skillupco/babel,kellyselden/babel,hzoo/babel,hzoo/babel,kaicataldo/babel,existentialism/babel,guybedford/babel,ternjs/acorn,luiseduardohdbackup/filbert,differentmatt/filbert,vadzim/babel,maurobringolf/babel,ternjs/acorn,marcominetti/acorn-babel,thr0w/acorn-jsx,maurobringolf/babel,chicoxyzzy/babel,hzoo/babel,CSNW/acorn,shuhei/babel,chicoxyzzy/babel