Automation for tagging and stage deployment
delete preloadtestplans when app is deleted (bug 1032775)
Merge pull request #2285 from ngokevin/master

delete preloadtestplans when app is deleted (bug 1032775)
add dev/stage/prod to iframe installer whitelist (bug 1033396)
check for navigator.mozApps in iframe installer (bug 1033760)
forgot quotes in iframe installer
Merge pull request #2283 from washort/stage-deploy

Automation for tagging and stage deployment
Constantify manifest content type
Support hidden apps in devhub (bug 1019249)