Feature - Handling Environments

This PR was created for the purpose of handling different environments and building them into classes that can be strictly type checked.

The EnvironmentFactory class can either take in a string, use the current `ENVIRONMENT` variable, or default to a `development` environment.

If the environment isn't recognized as one of the defined (development, staging, production) we create a CustomEnvironment class which will allow for custom configurations in the future.
This type-hint is no longer valid (the class doesn't exist anymore). Das test?