code: function (db, id, operations, cb) {
  			request.patch({
  				url: host + 'databases/' + db + '/docs/' + id,
  				headers: {
  					'Content-Type': 'application/json; charset=utf-8'
  				},
  				body: JSON.stringify(operations)
  			}, function (error, response, resBody) {
  				if (!error && response.statusCode === 200) {
  					var result = JSON.parse(resBody);
  					cb(null, result);
  				} else {
  					cb(error || new Error(response.statusCode), null);
  				}
  			});
  		}
docs: Applies patch operations to document with given id.
  @param {string} db
  @param {string} id
  @param {Array<Object>} operations
  @param {Function} cb