0.38.0

• Add ability to set target with OM_TARGET environment variable (thanks @kkallday!)
• Add staged-director-config command (thanks @jtarchie and @anEXPer!)
• Add --shasum flag to upload-stemcell to validate SHA256 checksum (thanks @jtarchie and @kcboyle!)
• Add --shasum flag to upload-product to validate SHA256 checksum (thanks @jtarchie and @kcboyle!)
• Add --vars-file flag to configure-product to interpolate variable
  placeholders (thanks @jtarchie!)
• Add --include-credentials flag to staged-config (thanks @jtarchie and @fredwangwang!)
• Add --include-placeholder flag to staged-config (thanks @jtarchie and @fredwangwang!)
• Placeholders are included for variables in output from config-template command (thanks @jtarchie and @kcboyle!)
• Values for property collections are now returned by staged-config (thanks @kcboyle and @fredwangwang!)
• Non-configurable properties are no longer returned from staged-config (thanks @jtarchie and @fredwangwang!)
• Fix issue where configure-director could cause director AZ and network configuration to get
  clobbered when run multiple times (fix depends on recent patches to Ops Manager)