function contains( arr, value ) {
	var i;
	for ( i = 0; i < arr.length; i++ ) {
		if ( arr[ i ] === value ) {
			return true;
		}
	}
	return false;
}
Tests whether a provided array contains a specified value.

@private
@param {Array} arr - input array
@param {*} value - search value
@returns {boolean} boolean indicating whether a provided array contains a specified value