{{alias}}( path[, options], clbk )
    Asynchronously resolves a path by walking parent directories.

    If unable to resolve a path, the function returns `null` as the path result.

    Parameters
    ----------
    path: string
        Path to resolve.

    options: Object (optional)
        Options.

    options.dir: string (optional)
        Base directory from which to search. Default: current working directory.

    clbk: Function
        Callback to invoke after resolving a path.

    Examples
    --------
    > function onPath( error, path ) {
    ...     if ( error ) {
    ...         console.error( error.message );
    ...     } else {
    ...         console.log( path );
    ...     }
    ... };
    > {{alias}}( 'package.json', onPath );


{{alias}}.sync( path[, options] )
    Synchronously resolves a path by walking parent directories.

    Parameters
    ----------
    path: string
        Path to resolve.

    options: Object (optional)
        Options.

    options.dir: string (optional)
        Base directory from which to search. Default: current working directory.

    Returns
    -------
    out: string|null
        Resolved path.

    Examples
    --------
    > var out = {{alias}}.sync( 'package.json' );

    See Also
    --------