Got unchained.t to pass.

* Created Node::CallNode to handle main objects. Ie {% if foo %}. Foo
  is treated as a method on the global namespace.

* Got unchained.t to pass.

* Fixed parsing.t

* Tweaked the grammar and modified it to eventually allow operators.

* Tweaked Node::IfTag to understand that it's probably going to get an
* array for statements. This I believe is an artifact from Pegex.