Set user color scheme based on environment

[mogmarsh]

Description

If the user has an alley email address, set the color scheme depending on the environment.

Use Case

As consultants, we rarely want to change things in production. It could be a useful feature and company norm to set different admin color schemes based on the environment (for instance, "Sunrise" on production, so that it is red and the user is aware that it is the production instance).