code: function Couchpenter(url, opts) {
    opts = opts || {};
  
    this.url = url || process.env.COUCHDB_URL || 'http://localhost:5984';
    this.opts = {
      setupFile: opts.setupFile || 'couchpenter.json',
      dir: opts.dir || process.cwd(),
      prefix: opts.prefix,
      setup: opts.dbSetup,
      interval: opts.interval
    };
  }
docs: class Couchpenter
  
  @param {String} url: CouchDB URL in format http(s)://user:pass@host:port, fallback to COUCHDB_URL environment variable, default to http://localhost:5984
  @param {Object} opts: optional
  - setupFile: Couchpenter setup file
  - dir: documents directory
  - prefix: prefix for database names
  - dbSetup: Couchpenter database setup object