Get some tests working (partially closes #112)

[kuraga]

See #112.

Repaired tests:

• test/rails/caching_test.rb
• test/rails/controller_methods_test.rb
• test/tree_node_test.rb
• test/widget_test.rb

Tests still are omit:

• test/rails/widget_generator_test.rb
• test/rails/view_helper_test.rb
• test/rails/rails_integration_test.rb

[apotonick]

Cool, merged it. In the remaining tests derived from ActiveSupport::TestCase etc. we should just use test blocks.

[kuraga]

we should just use test blocks

:-(