Gigalixir

+ Support new signup system

Bug fixes:
* remove pkg_resources dependency (homebrew issues)
* fix observer remote command

Add new database supports:
* specify database version on create: `gigalixir pg:create -v VERSION`
* allow upgrade of databases: `gigalixir pg:upgrade -d DATABASE_ID VERSION`

Bugfix

* fix: google oauth

* feat: support for detecting out of date CLI
* fix: deprecation warning of pipes
* docs: add upgrade instructions

fix: issue with rollbar certificate validation