function isRelativePath( value ) {
	return (
		isString( value ) &&
		!isAbsolutePath( value )
	);
}
Tests if a value is a POSIX relative path.

@param {*} value - value to test
@returns {boolean} boolean indicating if a value is a POSIX relative path

@example
var bool = isRelativePath( './foo/bar/baz' );
// returns true

@example
var bool = isRelativePath( '/foo/../bar/baz' );
// returns false