Use export <value> in environment.d.ts

[raghuvaran]

Fixes #260

[ghost]

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Happy coding!

[mike-north]

Babel shouldn't care about .d.ts files, and we're figuring out what to do with environment.d.ts in general.

export = foo is important in terms of making sure CommonJS style imports align with type information properly (it.s the types equivalent of module.exports = foo).

Your change would break type-checking on something like the following code on the node.js side of things

// ember-cli-build.js

// NOTE: this is _not_ consuming the default export
const env = require('config/environment');