Fix a bug in parsing of string keyed maps
Fix a bug in parsing of string keyed maps

Summary:
It tries to parse a json string literal inside quotes, and
obviously it fails.

Test Plan: worksforme

Reviewed By: watashi@fb.com

Subscribers: alandau, bmatheny, mshneer, yfeldblum, ckwalsh

FB internal diff: D1935860

Signature: t1:1935860:1427146603:c79a4b99107fb12c8dc632818df7bf8768544946

getyourguide/fbthrift,raphaelamorim/fbthrift,maxwell-demon/fbthrift,chjp2046/fbthrift,fengshao0907/fbthrift,kangkot/fbthrift,chjp2046/fbthrift,kangkot/fbthrift,soumith/fbthrift,soumith/fbthrift,LinusU/fbthrift,HankFaan/fbthrift,maxwell-demon/fbthrift,chjp2046/fbthrift,kangkot/fbthrift,kangkot/fbthrift,raphaelamorim/fbthrift,chjp2046/fbthrift,Orvid/fbthrift,Orvid/fbthrift,sinjar666/fbthrift,guker/fbthrift,project-zerus/fbthrift,project-zerus/fbthrift,HankFaan/fbthrift,fengshao0907/fbthrift,raphaelamorim/fbthrift,sinjar666/fbthrift,raphaelamorim/fbthrift,chjp2046/fbthrift,soumith/fbthrift,LinusU/fbthrift,getyourguide/fbthrift,SergeyMakarenko/fbthrift,SergeyMakarenko/fbthrift,HankFaan/fbthrift,Orvid/fbthrift,getyourguide/fbthrift,fengshao0907/fbthrift,getyourguide/fbthrift,chjp2046/fbthrift,Orvid/fbthrift,sinjar666/fbthrift,guker/fbthrift,raphaelamorim/fbthrift,facebook/fbthrift,chjp2046/fbthrift,soumith/fbthrift,getyourguide/fbthrift,LinusU/fbthrift,kangkot/fbthrift,HankFaan/fbthrift,guker/fbthrift,soumith/fbthrift,facebook/fbthrift,guker/fbthrift,Orvid/fbthrift,HankFaan/fbthrift,raphaelamorim/fbthrift,SergeyMakarenko/fbthrift,Orvid/fbthrift,facebook/fbthrift,maxwell-demon/fbthrift,getyourguide/fbthrift,getyourguide/fbthrift,sinjar666/fbthrift,Orvid/fbthrift,HankFaan/fbthrift,soumith/fbthrift,sinjar666/fbthrift,soumith/fbthrift,maxwell-demon/fbthrift,fengshao0907/fbthrift,soumith/fbthrift,chjp2046/fbthrift,HankFaan/fbthrift,LinusU/fbthrift,fengshao0907/fbthrift,LinusU/fbthrift,SergeyMakarenko/fbthrift,project-zerus/fbthrift,facebook/fbthrift,fengshao0907/fbthrift,Orvid/fbthrift,getyourguide/fbthrift,facebook/fbthrift,project-zerus/fbthrift,fengshao0907/fbthrift,kangkot/fbthrift,guker/fbthrift,getyourguide/fbthrift,project-zerus/fbthrift,soumith/fbthrift,LinusU/fbthrift,getyourguide/fbthrift,project-zerus/fbthrift,facebook/fbthrift,fengshao0907/fbthrift,SergeyMakarenko/fbthrift,raphaelamorim/fbthrift,HankFaan/fbthrift,SergeyMakarenko/fbthrift,getyourguide/fbthrift,sinjar666/fbthrift,kangkot/fbthrift,SergeyMakarenko/fbthrift,project-zerus/fbthrift,SergeyMakarenko/fbthrift,Orvid/fbthrift,soumith/fbthrift,LinusU/fbthrift,SergeyMakarenko/fbthrift,raphaelamorim/fbthrift,SergeyMakarenko/fbthrift,guker/fbthrift,facebook/fbthrift,maxwell-demon/fbthrift,kangkot/fbthrift,fengshao0907/fbthrift,maxwell-demon/fbthrift,LinusU/fbthrift,HankFaan/fbthrift,guker/fbthrift,LinusU/fbthrift,soumith/fbthrift,kangkot/fbthrift,Orvid/fbthrift,raphaelamorim/fbthrift,maxwell-demon/fbthrift,guker/fbthrift,SergeyMakarenko/fbthrift,sinjar666/fbthrift,project-zerus/fbthrift,chjp2046/fbthrift,Orvid/fbthrift,HankFaan/fbthrift,HankFaan/fbthrift,maxwell-demon/fbthrift,project-zerus/fbthrift,sinjar666/fbthrift,guker/fbthrift,raphaelamorim/fbthrift,LinusU/fbthrift,facebook/fbthrift,facebook/fbthrift,project-zerus/fbthrift,maxwell-demon/fbthrift,SergeyMakarenko/fbthrift,chjp2046/fbthrift,project-zerus/fbthrift,fengshao0907/fbthrift,kangkot/fbthrift,sinjar666/fbthrift,raphaelamorim/fbthrift,maxwell-demon/fbthrift,sinjar666/fbthrift,LinusU/fbthrift,getyourguide/fbthrift,maxwell-demon/fbthrift,kangkot/fbthrift,sinjar666/fbthrift,chjp2046/fbthrift,project-zerus/fbthrift,fengshao0907/fbthrift,chjp2046/fbthrift,guker/fbthrift,guker/fbthrift