Work around flaky gulp-vulcanize
Work around flaky gulp-vulcanize

https://github.com/Polymer/vulcanize/issues/190

kristianmandrup/polymer,cbmeeks/polymer,ikeagold/polymer,vic/polymer,tekjava/polymer,Tudes/polymer,filaraujo/polymer,Endika/polymer,samccone/polymer,ankurvr/polymer,dalong123/polymer,tekjava/polymer,akintoey/polymer,henrylee2cn/polymer,yforrest/polymer,HiWong/polymer,MartinMoizard/polymer,ThiagoGarciaAlves/polymer,yforrest/polymer,tekjava/polymer,jvkops/polymer,Flip120/polymer,studiowangfei/polymer,leitzler/polymer,Kabele/polymer,filaraujo/polymer,carbono-io/polymer,bright-sparks/polymer,simonfan/polymer,simonsoft/polymer,JeremybellEU/polymer,MetaMemoryT/polymer,jordanyaker/polymer,mauricionr/polymer,Litor/polymer,gazal-k/polymer,exlerdesigns/polymer,jordanyaker/polymer,sekiyaeiji/polymer,japacible/polymer,mgiuffrida/polymer,ktiedt/polymer,JeremybellEU/polymer,jscissr/polymer,jordanyaker/polymer,elkamel/polymer,cgvarela/polymer,udhayam/polymer,exlerdesigns/polymer,simo97/polymer,jscissr/polymer,jpalomar/polymer,gronke/polymer,Zagorakiss/polymer,simo97/polymer,HiWong/polymer,cgvarela/polymer,dotDeeka/polymer,carbono-io/polymer,carbono-io/polymer,YOTOV-LIMITED/polymer,Endika/polymer,rafaelducati/polymer,udhayam/polymer,MetaMemoryT/polymer,mgiuffrida/polymer,fjkfwz/polymer,JeremybellEU/polymer,udhayam/polymer,zxs0827/polymer,exlerdesigns/polymer,jvkops/polymer,Flip120/polymer,zebMcCorkle/polymer,samccone/polymer,jpalomar/polymer,tachyon1337/polymer,chimpinano/polymer,henrylee2cn/polymer,gazal-k/polymer,jforge/polymer,bright-sparks/polymer,Litor/polymer,Tudes/polymer,kristianmandrup/polymer,ilovezy/polymer,dalong123/polymer,gazal-k/polymer,dotDeeka/polymer,itnirmaan/polymer,pacificIT/polymer,HiWong/polymer,jvkops/polymer,pacificIT/polymer,elkamel/polymer,mauricionr/polymer,ktiedt/polymer,gronke/polymer,BrianLTJ/polymer,Kabele/polymer,chimpinano/polymer,M4gn4tor/polymer,jscissr/polymer,paulballesty/polymer,tachyon1337/polymer,filaraujo/polymer,ikeagold/polymer,Polymer/polymer,MartinMoizard/polymer,vic/polymer,marcus7777/polymer,MartinsThiago/polymer,fjkfwz/polymer,samccone/polymer,codegist/polymer,kristianmandrup/polymer,akintoey/polymer,MartinMoizard/polymer,rafaelducati/polymer,jforge/polymer,akintoey/polymer,MartinsThiago/polymer,gronke/polymer,mgiuffrida/polymer,youprofit/polymer,zxs0827/polymer,chimpinano/polymer,pacificIT/polymer,marcus7777/polymer,yforrest/polymer,ilovezy/polymer,elkamel/polymer,simonfan/polymer,thiagolucio/polymer,tjsavage/polymer,tjsavage/polymer,studiowangfei/polymer,cgvarela/polymer,JsonChiu/polymer,paulballesty/polymer,TedaLIEz/polymer,sekiyaeiji/polymer,Zagorakiss/polymer,fjkfwz/polymer,cbmeeks/polymer,yangjae/polymer,YOTOV-LIMITED/polymer,Endika/polymer,simonsoft/polymer,youprofit/polymer,thiagolucio/polymer,itnirmaan/polymer,codegist/polymer,Tudes/polymer,dalong123/polymer,thiagolucio/polymer,zebMcCorkle/polymer,simo97/polymer,itnirmaan/polymer,leitzler/polymer,ktiedt/polymer,TedaLIEz/polymer,ankurvr/polymer,JsonChiu/polymer,simonfan/polymer,yangjae/polymer,Polymer/polymer,brandonmowat/polymer,YOTOV-LIMITED/polymer,ThiagoGarciaAlves/polymer,tjsavage/polymer,bright-sparks/polymer,M4gn4tor/polymer,japacible/polymer,BrianLTJ/polymer,henrylee2cn/polymer,ikeagold/polymer,MartinsThiago/polymer,cbmeeks/polymer,brandonmowat/polymer,Polymer/polymer,BrianLTJ/polymer,zxs0827/polymer,Litor/polymer,jpalomar/polymer