add environment var in settings

[kaminskypavel]

would be nice to have a default environment var inside developmet.js/production.js/test.js/all.js

app: {
title: 'bla bla bla',
description: 'Full-Stack JavaScript with MongoDB, Express, AngularJS, and Node.js',
keywords: 'bla bla',
enviroment : 'all'
},

[rschwabco]

That kind of defeats the purpose of it being a variable set by the environment...