Comparison Query Operators Like MongoDB

You can also selects indexed value with some "Comparison Query Operators" (like mongodb)
The options are:
* $gte = greater than or equal to (i.e. >=)
* $gt = greater than (i.e. >)
* $lte = less than or equal to (i.e. <=)
* $lt = less than (i.e. <)

See an example.

	var theater = new Theater() // Theater is a collection of movies
	theater.fetch({
		conditions: {year: {$gte: 2013},
		success: function() {
			// The theater collection will be populated with all the movies with year >= 2013
		}
	});