Modifier plugin names conflict with template variable names

[umakantp]

If there is both a modifier and a variable in a scope, the two will conflict, and the modifier won't be accessible within the data section.

Example:

jSmart.prototype.registerPlugin(
    'modifier',
    'round',
    function(num, digits)
    {
        var multiplier = Math.pow(10, digits);
        return Math.round(num * multiplier) / multiplier;
    }
);

var tpl = new jSmart('{$round} {$num|round:2}');
tpl.fetch({a: 2.1324, round: 2});

Bug was reported at https://code.google.com/p/jsmart/issues/detail?id=21