docs: function buildEnvTemplates(opts, callback) {
    var envOptsObj = envOpts(opts);
    var envOptsKeys = _.keys(envOptsObj);
    var writeEnvFiles = function(envKey, writeCallback) {
      fs.writeFile(opts.processEnvDir + '/' + envKey, envOptsObj[envKey], function(err) {
        if (err) {
  	return callback(err.message);
        } else {
  	return writeCallback(null);
        }
      });
    };
  
    async.forEach(envOptsKeys, writeEnvFiles, callback);
  }