Binders: collection

TODO:

/**
 * NOT IMPLEMENTED YET
 * @example
 * 
 * # EXAMPLE
 * 
 * {collection list="red, green, blue" assign_to="colors"}
 * // OR
 * {collection item="red" assign_to="colors"}
 * {collection item="green" assign_to="colors"}
 * {collection item="blue" assign_to="colors"}
 * 
 * <ul>
 * {foreach $colors as $color}
 * 	<li>{$color}</li>
 * {/foreach}
 * <ul>
 * 
 * // OR
 * 
 * {unset var="colors"}
 * 
 *
 */