Fix bug when skipping bool in fastproto
Fix bug when skipping bool in fastproto

Summary:
In compact readBool can return 0 so skip isn't failing in this
case.

Test Plan:
Caught this bug when trying to replace
thrift/test/py/SerializationTest.py with fastproto in D1868315.
testBackwards fails when the bool field in a VersioningTestV2 object
needs to be skipped because it is deserializd as a VersioningTestV1
object. With this fix it works.

Reviewed By: alandau@fb.com

Subscribers: ruibalp, alandau, bmatheny, mshneer, yfeldblum

FB internal diff: D1869499

Signature: t1:1869499:1424830344:b7eb53aead2ff26e41c0f9446339bda7b6be6b53

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