Update to gosu 1.2 (including GPG verification)
Merge pull request #35 from infosiftr/gosu-1.2

Update to gosu 1.2 (including GPG verification)
Add POSTGRES_PASSWORD and USER, with warning on no password
Bump 9.4 to rc1
Merge pull request #36 from infosiftr/password

Add POSTGRES_PASSWORD and USER, with warning on no password