Release v0.18.2

Changelog

Other

• 1fb1c45: Add metadata for storing stage app path (@akclace)
• 6890448: Changed default staging location for apps to be based on subdomain (@akclace)
• 318994b: Fix health check failure error (@akclace)
• ac5a552: Fix index error in list apps (@akclace)
• 34f4024: Use linked app path for stage app (@akclace)
• 550518c: fix #98: Added verify_file internal api to check file status (@akclace)