Make it possible to spin up the dev site without Elasticsearch or NodeJS

[bbusenius]

Issue

Use environment variables to make it possible to spin up a dev version of the site that doesn't use Elasticsearch, Java, or NodeJS. Since we don't need these features for the vast majority of development and they slow down the build process, they should be optional. Is there anything else we should make optional?

Other information:

• https://stackoverflow.com/questions/14124234/how-to-pass-parameter-on-vagrant-up-and-have-it-in-the-scope-of-vagrantfile
• https://stackoverflow.com/questions/26811089/vagrant-how-to-have-host-platform-specific-provisioning-steps