* the include tag now merges the passed variables with the current context by default
(the old behavior is still possible by adding the "only" keyword)
+ * escaping has been rewritten (from pre-escaping to post-escaping)
* the implementation of template inheritance has been rewritten
(blocks can now be called individually and still work with inheritance)
* fixed error handling for if tag when a syntax error occurs within a subparse process
* removed the debug tag (should be done in an extension)
* fixed trans tag when no vars are used in plural form
* fixed race condition when writing template cache
- * fixed inheritance
* added the special _context variable to reference the current context
* renamed self to _self (to avoid conflict)
* fixed Twig_Template::getAttribute() for protected properties