Get tests working (closes #112)

@apotonick, done.

Repaired tests:

 * test/rails/widget_generator_test.rb
 * test/rails/view_helper_test.rb
 * test/rails/rails_integration_test.rb

Tests still are omit: (none)
Proof:

 $ rake
    <...>
    153 tests, 258 assertions, 0 failures, 5 errors, 2 skips

 $ grep -r "test \"" test | wc
     22     164    1775

 $ grep -r "it \"" test | wc
    130    1056    9443

But there are errors in:

  * test/rails/rails_integration_test.rb