Fix AppVeyor build script to correctly return error code
Fix AppVeyor build script to correctly return error code

The script chained the execution of VsDevCmd.bat (aka the "Developer
Command Prompt") with build.cmd which seems to confuse AppVeyor
into not recognizing a non-zero exit code (i.e. when a test fails)
and incorrectly marking the build as green.

Invoking VsDevCmd.bat and build.cmd in two separate steps fixes this.

Fixes #214

wtgodbe/corefx,zmaruo/corefx,oceanho/corefx,scott156/corefx,misterzik/corefx,lydonchandra/corefx,matthubin/corefx,elijah6/corefx,PatrickMcDonald/corefx,Ermiar/corefx,billwert/corefx,shmao/corefx,jhendrixMSFT/corefx,lggomez/corefx,the-dwyer/corefx,cnbin/corefx,PatrickMcDonald/corefx,tijoytom/corefx,nchikanov/corefx,shmao/corefx,xuweixuwei/corefx,alexperovich/corefx,fffej/corefx,dhoehna/corefx,nelsonsar/corefx,SGuyGe/corefx,mazong1123/corefx,scott156/corefx,dotnet-bot/corefx,khdang/corefx,Chrisboh/corefx,larsbj1988/corefx,nelsonsar/corefx,dhoehna/corefx,iamjasonp/corefx,Frank125/corefx,krk/corefx,jhendrixMSFT/corefx,n1ghtmare/corefx,twsouthwick/corefx,Yanjing123/corefx,chaitrakeshav/corefx,weltkante/corefx,bitcrazed/corefx,JosephTremoulet/corefx,gkhanna79/corefx,zhangwenquan/corefx,jhendrixMSFT/corefx,dkorolev/corefx,krk/corefx,vidhya-bv/corefx-sorting,dsplaisted/corefx,mokchhya/corefx,krytarowski/corefx,Priya91/corefx-1,nbarbettini/corefx,Ermiar/corefx,marksmeltzer/corefx,spoiledsport/corefx,krytarowski/corefx,tijoytom/corefx,EverlessDrop41/corefx,twsouthwick/corefx,mellinoe/corefx,manu-silicon/corefx,tstringer/corefx,bpschoch/corefx,alexperovich/corefx,SGuyGe/corefx,DnlHarvey/corefx,gkhanna79/corefx,Petermarcu/corefx,mellinoe/corefx,vrassouli/corefx,rahku/corefx,weltkante/corefx,pgavlin/corefx,gabrielPeart/corefx,rajansingh10/corefx,axelheer/corefx,anjumrizwi/corefx,shimingsg/corefx,alphonsekurian/corefx,chenkennt/corefx,contoso-dnf-a/corefx,ravimeda/corefx,690486439/corefx,iamjasonp/corefx,CloudLens/corefx,billwert/corefx,chaitrakeshav/corefx,elijah6/corefx,mmitche/corefx,jhendrixMSFT/corefx,manu-silicon/corefx,ericstj/corefx,jlin177/corefx,lggomez/corefx,marksmeltzer/corefx,heXelium/corefx,kkurni/corefx,oceanho/corefx,ericstj/corefx,pallavit/corefx,pallavit/corefx,mmitche/corefx,stormleoxia/corefx,lydonchandra/corefx,zhenlan/corefx,seanshpark/corefx,wtgodbe/corefx,vs-team/corefx,DnlHarvey/corefx,stephenmichaelf/corefx,lggomez/corefx,EverlessDrop41/corefx,s0ne0me/corefx,mokchhya/corefx,cydhaselton/corefx,shrutigarg/corefx,Petermarcu/corefx,chenxizhang/corefx,Jiayili1/corefx,elijah6/corefx,alphonsekurian/corefx,zhangwenquan/corefx,mazong1123/corefx,pgavlin/corefx,mellinoe/corefx,CherryCxldn/corefx,yizhang82/corefx,seanshpark/corefx,BrennanConroy/corefx,ravimeda/corefx,rjxby/corefx,krytarowski/corefx,rajansingh10/corefx,Frank125/corefx,marksmeltzer/corefx,alexandrnikitin/corefx,bitcrazed/corefx,dotnet-bot/corefx,dhoehna/corefx,KrisLee/corefx,shahid-pk/corefx,krk/corefx,vidhya-bv/corefx-sorting,zhenlan/corefx,claudelee/corefx,xuweixuwei/corefx,dotnet-bot/corefx,mellinoe/corefx,akivafr123/corefx,dhoehna/corefx,weltkante/corefx,Yanjing123/corefx,alphonsekurian/corefx,ericstj/corefx,jlin177/corefx,richlander/corefx,DnlHarvey/corefx,ViktorHofer/corefx,alexperovich/corefx,parjong/corefx,Ermiar/corefx,axelheer/corefx,alexandrnikitin/corefx,alexperovich/corefx,richlander/corefx,pallavit/corefx,nbarbettini/corefx,matthubin/corefx,VPashkov/corefx,richlander/corefx,ViktorHofer/corefx,weltkante/corefx,vidhya-bv/corefx-sorting,gabrielPeart/corefx,thiagodin/corefx,shana/corefx,benpye/corefx,shrutigarg/corefx,erpframework/corefx,uhaciogullari/corefx,rajansingh10/corefx,huanjie/corefx,dkorolev/corefx,zhenlan/corefx,shiftkey-tester/corefx,nchikanov/corefx,shana/corefx,jlin177/corefx,arronei/corefx,mmitche/corefx,anjumrizwi/corefx,YoupHulsebos/corefx,chenxizhang/corefx,tijoytom/corefx,ViktorHofer/corefx,dotnet-bot/corefx,uhaciogullari/corefx,ptoonen/corefx,tstringer/corefx,parjong/corefx,wtgodbe/corefx,bpschoch/corefx,dtrebbien/corefx,popolan1986/corefx,vidhya-bv/corefx-sorting,cartermp/corefx,mafiya69/corefx,janhenke/corefx,huanjie/corefx,mazong1123/corefx,mafiya69/corefx,VPashkov/corefx,anjumrizwi/corefx,krk/corefx,shimingsg/corefx,kyulee1/corefx,DnlHarvey/corefx,shahid-pk/corefx,benpye/corefx,rjxby/corefx,matthubin/corefx,gkhanna79/corefx,Jiayili1/corefx,mellinoe/corefx,destinyclown/corefx,DnlHarvey/corefx,vijaykota/corefx,cartermp/corefx,comdiv/corefx,mazong1123/corefx,billwert/corefx,PatrickMcDonald/corefx,rubo/corefx,alexandrnikitin/corefx,JosephTremoulet/corefx,jeremymeng/corefx,jhendrixMSFT/corefx,cydhaselton/corefx,jeremymeng/corefx,comdiv/corefx,marksmeltzer/corefx,shiftkey-tester/corefx,krytarowski/corefx,DnlHarvey/corefx,iamjasonp/corefx,JosephTremoulet/corefx,fgreinacher/corefx,manu-silicon/corefx,billwert/corefx,parjong/corefx,fernando-rodriguez/corefx,ellismg/corefx,Jiayili1/corefx,MaggieTsang/corefx,Priya91/corefx-1,parjong/corefx,cydhaselton/corefx,axelheer/corefx,Priya91/corefx-1,josguil/corefx,akivafr123/corefx,vs-team/corefx,zhangwenquan/corefx,krytarowski/corefx,wtgodbe/corefx,nchikanov/corefx,shiftkey-tester/corefx,shahid-pk/corefx,kyulee1/corefx,contoso-dnf-a/corefx,benjamin-bader/corefx,chenkennt/corefx,mafiya69/corefx,alphonsekurian/corefx,ravimeda/corefx,destinyclown/corefx,stephenmichaelf/corefx,JosephTremoulet/corefx,MaggieTsang/corefx,stone-li/corefx,benjamin-bader/corefx,twsouthwick/corefx,kkurni/corefx,shmao/corefx,weltkante/corefx,ViktorHofer/corefx,vidhya-bv/corefx-sorting,Alcaro/corefx,pallavit/corefx,shimingsg/corefx,CherryCxldn/corefx,larsbj1988/corefx,shawnhar/corefx,ericstj/corefx,nbarbettini/corefx,khdang/corefx,jhendrixMSFT/corefx,yizhang82/corefx,jcme/corefx,bitcrazed/corefx,mmitche/corefx,fgreinacher/corefx,billwert/corefx,manu-silicon/corefx,dotnet-bot/corefx,alexperovich/corefx,stone-li/corefx,shawnhar/corefx,vs-team/corefx,dsplaisted/corefx,ptoonen/corefx,josguil/corefx,Chrisboh/corefx,stephenmichaelf/corefx,vs-team/corefx,kyulee1/corefx,weltkante/corefx,gkhanna79/corefx,FiveTimesTheFun/corefx,CloudLens/corefx,arronei/corefx,claudelee/corefx,kkurni/corefx,JosephTremoulet/corefx,rahku/corefx,josguil/corefx,benjamin-bader/corefx,marksmeltzer/corefx,lydonchandra/corefx,nbarbettini/corefx,the-dwyer/corefx,billwert/corefx,jcme/corefx,twsouthwick/corefx,wtgodbe/corefx,mafiya69/corefx,shmao/corefx,axelheer/corefx,rubo/corefx,viniciustaveira/corefx,PatrickMcDonald/corefx,richlander/corefx,ellismg/corefx,alexperovich/corefx,axelheer/corefx,zmaruo/corefx,pallavit/corefx,Alcaro/corefx,JosephTremoulet/corefx,thiagodin/corefx,twsouthwick/corefx,cydhaselton/corefx,ellismg/corefx,Yanjing123/corefx,krytarowski/corefx,fgreinacher/corefx,brett25/corefx,Jiayili1/corefx,jlin177/corefx,dkorolev/corefx,Winsto/corefx,nelsonsar/corefx,cnbin/corefx,YoupHulsebos/corefx,zhenlan/corefx,seanshpark/corefx,thiagodin/corefx,VPashkov/corefx,wtgodbe/corefx,josguil/corefx,Yanjing123/corefx,lydonchandra/corefx,Petermarcu/corefx,ptoonen/corefx,huanjie/corefx,nbarbettini/corefx,akivafr123/corefx,uhaciogullari/corefx,nelsonsar/corefx,Ermiar/corefx,jlin177/corefx,brett25/corefx,wtgodbe/corefx,stephenmichaelf/corefx,690486439/corefx,rahku/corefx,shimingsg/corefx,nchikanov/corefx,cydhaselton/corefx,yizhang82/corefx,MaggieTsang/corefx,stormleoxia/corefx,rubo/corefx,janhenke/corefx,arronei/corefx,Chrisboh/corefx,vrassouli/corefx,gabrielPeart/corefx,ViktorHofer/corefx,the-dwyer/corefx,khdang/corefx,tstringer/corefx,mmitche/corefx,oceanho/corefx,alexandrnikitin/corefx,n1ghtmare/corefx,ptoonen/corefx,tstringer/corefx,matthubin/corefx,gregg-miskelly/corefx,gregg-miskelly/corefx,ravimeda/corefx,thiagodin/corefx,rjxby/corefx,cnbin/corefx,n1ghtmare/corefx,elijah6/corefx,CherryCxldn/corefx,popolan1986/corefx,benpye/corefx,shahid-pk/corefx,Chrisboh/corefx,heXelium/corefx,lggomez/corefx,adamralph/corefx,larsbj1988/corefx,claudelee/corefx,ptoonen/corefx,the-dwyer/corefx,zmaruo/corefx,CloudLens/corefx,zhenlan/corefx,kkurni/corefx,MaggieTsang/corefx,iamjasonp/corefx,DnlHarvey/corefx,stone-li/corefx,zhenlan/corefx,adamralph/corefx,mellinoe/corefx,chenkennt/corefx,shiftkey-tester/corefx,janhenke/corefx,dkorolev/corefx,SGuyGe/corefx,mazong1123/corefx,ericstj/corefx,Petermarcu/corefx,SGuyGe/corefx,FiveTimesTheFun/corefx,janhenke/corefx,690486439/corefx,vijaykota/corefx,zhenlan/corefx,dhoehna/corefx,690486439/corefx,cydhaselton/corefx,lggomez/corefx,marksmeltzer/corefx,jeremymeng/corefx,Petermarcu/corefx,KrisLee/corefx,mmitche/corefx,Chrisboh/corefx,khdang/corefx,lggomez/corefx,xuweixuwei/corefx,gkhanna79/corefx,690486439/corefx,nbarbettini/corefx,rubo/corefx,rjxby/corefx,benpye/corefx,jcme/corefx,SGuyGe/corefx,fgreinacher/corefx,parjong/corefx,YoupHulsebos/corefx,jeremymeng/corefx,vrassouli/corefx,ellismg/corefx,Ermiar/corefx,jmhardison/corefx,mokchhya/corefx,stormleoxia/corefx,iamjasonp/corefx,cartermp/corefx,cnbin/corefx,benjamin-bader/corefx,FiveTimesTheFun/corefx,shmao/corefx,stephenmichaelf/corefx,JosephTremoulet/corefx,shimingsg/corefx,viniciustaveira/corefx,manu-silicon/corefx,ptoonen/corefx,bpschoch/corefx,alphonsekurian/corefx,nbarbettini/corefx,ravimeda/corefx,stone-li/corefx,lggomez/corefx,spoiledsport/corefx,benjamin-bader/corefx,popolan1986/corefx,jcme/corefx,janhenke/corefx,tijoytom/corefx,ericstj/corefx,misterzik/corefx,zhangwenquan/corefx,seanshpark/corefx,dotnet-bot/corefx,CherryCxldn/corefx,dotnet-bot/corefx,alexperovich/corefx,jeremymeng/corefx,dtrebbien/corefx,Priya91/corefx-1,destinyclown/corefx,Alcaro/corefx,shana/corefx,rahku/corefx,mmitche/corefx,ViktorHofer/corefx,KrisLee/corefx,s0ne0me/corefx,elijah6/corefx,shmao/corefx,rjxby/corefx,claudelee/corefx,akivafr123/corefx,alphonsekurian/corefx,richlander/corefx,Jiayili1/corefx,jmhardison/corefx,mazong1123/corefx,YoupHulsebos/corefx,kkurni/corefx,stone-li/corefx,anjumrizwi/corefx,rjxby/corefx,josguil/corefx,shana/corefx,iamjasonp/corefx,erpframework/corefx,Frank125/corefx,the-dwyer/corefx,gabrielPeart/corefx,s0ne0me/corefx,benpye/corefx,tijoytom/corefx,stone-li/corefx,the-dwyer/corefx,yizhang82/corefx,CloudLens/corefx,brett25/corefx,yizhang82/corefx,tijoytom/corefx,yizhang82/corefx,chaitrakeshav/corefx,Chrisboh/corefx,Petermarcu/corefx,viniciustaveira/corefx,benpye/corefx,shrutigarg/corefx,yizhang82/corefx,n1ghtmare/corefx,MaggieTsang/corefx,dtrebbien/corefx,ericstj/corefx,gkhanna79/corefx,mafiya69/corefx,krk/corefx,Jiayili1/corefx,heXelium/corefx,parjong/corefx,bitcrazed/corefx,fffej/corefx,pgavlin/corefx,josguil/corefx,larsbj1988/corefx,jhendrixMSFT/corefx,manu-silicon/corefx,scott156/corefx,krk/corefx,Priya91/corefx-1,richlander/corefx,rubo/corefx,kkurni/corefx,jmhardison/corefx,scott156/corefx,axelheer/corefx,khdang/corefx,pallavit/corefx,gregg-miskelly/corefx,heXelium/corefx,oceanho/corefx,YoupHulsebos/corefx,kyulee1/corefx,s0ne0me/corefx,ViktorHofer/corefx,comdiv/corefx,shawnhar/corefx,elijah6/corefx,rahku/corefx,cartermp/corefx,manu-silicon/corefx,andyhebear/corefx,mokchhya/corefx,krytarowski/corefx,Petermarcu/corefx,uhaciogullari/corefx,akivafr123/corefx,SGuyGe/corefx,benjamin-bader/corefx,gregg-miskelly/corefx,nchikanov/corefx,twsouthwick/corefx,shmao/corefx,fernando-rodriguez/corefx,parjong/corefx,andyhebear/corefx,stormleoxia/corefx,huanjie/corefx,KrisLee/corefx,comdiv/corefx,rajansingh10/corefx,bitcrazed/corefx,erpframework/corefx,pgavlin/corefx,rahku/corefx,cartermp/corefx,khdang/corefx,gkhanna79/corefx,erpframework/corefx,chaitrakeshav/corefx,MaggieTsang/corefx,cydhaselton/corefx,contoso-dnf-a/corefx,Ermiar/corefx,iamjasonp/corefx,vijaykota/corefx,shimingsg/corefx,tstringer/corefx,twsouthwick/corefx,ptoonen/corefx,rahku/corefx,vrassouli/corefx,dhoehna/corefx,BrennanConroy/corefx,mokchhya/corefx,dhoehna/corefx,ellismg/corefx,andyhebear/corefx,Priya91/corefx-1,stephenmichaelf/corefx,jlin177/corefx,mazong1123/corefx,seanshpark/corefx,elijah6/corefx,ravimeda/corefx,fernando-rodriguez/corefx,seanshpark/corefx,fffej/corefx,zmaruo/corefx,nchikanov/corefx,Winsto/corefx,jmhardison/corefx,tstringer/corefx,jcme/corefx,stephenmichaelf/corefx,misterzik/corefx,Frank125/corefx,dsplaisted/corefx,Winsto/corefx,andyhebear/corefx,shahid-pk/corefx,krk/corefx,spoiledsport/corefx,BrennanConroy/corefx,dtrebbien/corefx,MaggieTsang/corefx,ellismg/corefx,mafiya69/corefx,tijoytom/corefx,nchikanov/corefx,shrutigarg/corefx,cartermp/corefx,fffej/corefx,mokchhya/corefx,ravimeda/corefx,PatrickMcDonald/corefx,janhenke/corefx,YoupHulsebos/corefx,YoupHulsebos/corefx,rjxby/corefx,alphonsekurian/corefx,n1ghtmare/corefx,jlin177/corefx,brett25/corefx,seanshpark/corefx,VPashkov/corefx,marksmeltzer/corefx,bpschoch/corefx,chenxizhang/corefx,the-dwyer/corefx,alexandrnikitin/corefx,billwert/corefx,viniciustaveira/corefx,weltkante/corefx,richlander/corefx,EverlessDrop41/corefx,shimingsg/corefx,adamralph/corefx,Jiayili1/corefx,Ermiar/corefx,jcme/corefx,Alcaro/corefx,shahid-pk/corefx,Yanjing123/corefx,stone-li/corefx