[loose parser] Fix bug in continued-expression closing
[loose parser] Fix bug in continued-expression closing

When the continued expression sat on column 1 after a non-whitespace char,
the heuristic would consider it the start of the line, even though it wasn't.

Issue marijnh/tern#141

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