Adds additional values to `environments.json`

Adds support for a `jasmine` environment, as well as extending the `amd` environment definition.

As an avid user of [jasmine](http://jasmine.github.io/) for testing my [angular](http://angularjs.org) apps, specifically with [karma](http://karma-runner.github.io), this pull request adds support for defining a "jasmine" environment. This globals defined cover both 1.3 and 2.0.

As for requirejs, if you navigate to the requirejs [api](http://requirejs.org/docs/api.html#jsfiles), specifically about configuring requirejs, you can see an example where the `requirejs` Object is being used.