Update decorator parsing to match current spec
Update decorator parsing to match current spec

Refer to PR #353

shuhei/babel,kellyselden/babel,claudiopro/babel,samwgoldman/babel,kaicataldo/babel,vadzim/babel,chicoxyzzy/babel,guybedford/babel,babel/babel,kellyselden/babel,samwgoldman/babel,hulkish/babel,babel/babylon,existentialism/babel,chicoxyzzy/babel,guybedford/babel,PolymerLabs/babel,kellyselden/babel,hulkish/babel,jridgewell/babel,kaicataldo/babel,hulkish/babel,shuhei/babel,hzoo/babel,babel/babel,cbishopvelti/babylon,shuhei/babel,samwgoldman/babel,babel/babel,claudiopro/babel,hzoo/babel,jridgewell/babel,jridgewell/babel,Skillupco/babel,kaicataldo/babel,Skillupco/babel,kellyselden/babel,jridgewell/babel,claudiopro/babel,hzoo/babel,existentialism/babel,existentialism/babel,vadzim/babel,chicoxyzzy/babel,PolymerLabs/babel,maurobringolf/babel,PolymerLabs/babel,guybedford/babel,chicoxyzzy/babel,maurobringolf/babel,hzoo/babel,Skillupco/babel,babel/babel,hulkish/babel,maurobringolf/babel,Skillupco/babel,kaicataldo/babel