Dwoo - a PHP Template Engine

Changelog

+ Added {optional} plugin that just prints an optional var without any notice if it doesn't exist
+ Added Dwoo::setTemplate() for testing purposes mostly
* Fixed an {extends} parsing bug that prevented the use of single-quotes around the parent template's filename
* Fixed a security issue, if you didn't use a custom compiler factory but passed the compiler directly to the get method with autoEscape enabled, the autoEscape was disabled in included templates - Thanks to Fabien Potencier for notifying me.
* Fixed a bug in {safe} when using variable-variables it would sometimes corrupt the var name resulting in blank output
* Fixed a bug when accessing array indices that contain a minus sign, it is now possible to access those using {$var[index-foo]}, {$var['index-foo']} or {$index="index-foo"} {$var[$index]}
* Fixed a bug in {tif} that didn't work when 0 was given as the true or false value
* Fixed a bug when using the autoEscape feature with sub-templates (the compiled sub-template couldn't access the dwoo charset property, resulting in a fatal error)
* Fixed a property reading bug on objects that implemented __get but not __isset, implementing __isset is however very much recommended
* Fixed a Dwoo_Data bug in the append method when the index didn't exist yet it threw a notice
* Fixed a bug when accessing global vars from a sub-template
* Fixed a couple bugs in the {dynamic} plugin with regard to using plugins within a dynamic block
* Fixed a compilation bug when using a PluginProxy with highly nested calls
* Fixed a {load_templates} bug, plugins used in external templates were not loaded correctly, same for custom user plugins
* Cached templates now check the source template for modification before outputting the cached version
* Removed a couple of @-operator calls to file_get_contents