code: function getCollection() {
  
      var config = {
          properties: {
              collection: {
                  description: 'Collection name and number of rows, 5 if omitted (ex: posts 10): '.magenta,
                  type: 'string',
                  required: true
              }
          }
      };
  
      prompt.start();
      prompt.message = ' > ';
      prompt.delimiter = '';
  
      return new Promise(function(resolve, reject) {
          prompt.get(config, function(err, result) {
              if (err) return reject(err);
              return resolve(result.collection);
          });
      });
  }
docs: Prompt for collection name.
  @return {Promise}