Wed Feb 15 11:49:41 2012 Aaron Patterson <aaron@tenderlovemaking.com>

* lib/journey/formatter.rb: reject non-truthy parameters parts.
  Fixes rails ticket #4587

Mon Jan 23 17:07:53 2012 Aaron Patterson <aaron@tenderlovemaking.com>

* Added symbol? and literal? predicate methods to the ast nodes for
easier AST traversal.
* Made the dummy node a real class.

[Validate]

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