Add a failing test case for #263
Update assertion

The parser should be nil after attempting to parse the rdoc markup
directive.
Merge pull request #269 from reinh/markup-directive-error

Add a failing test case for #263
Fix failing test from #269

This also addresses #262 by defaulting to the file extension's parser
when the parser is unknown and allows RDoc to fall back to using the
:markup: directive as a class comment directive in addition of a special
file handling directive.

Fixes #262
Improve test name

We are really testing behavior for unknown file parsers here.
Exclude racc 1.4.10 as it is not 1.8.7 compatible

This works around tenderlove/racc#34
fix syntax for not-equals dependency from @f668452
Fix variable shadowing
Add #262 and #269 to history

Fix location of #259 and #265 in history
Set release version and date
Remove trailing whitespace
Import ruby trunk r43772

> don't call gem method if Test::Unit is defined
>
> ruby's test-all may define 'gem' method somewhere,
> and it cause test failure.
Import ruby trunk r43725

> test_rdoc_generator_darkfish.rb: ignore nlink is not provided
>
> * test/rdoc/test_rdoc_generator_darkfish.rb (assert_hard_link): makes
>   no sense on platforms where link count is not provided.
Import r43006 from ruby trunk

> rdoc/constant.rb: workaround of NoMethodError
>
> * lib/rdoc/constant.rb (RDoc::Constant#documented?): workaround for
>   NoMethodError when the original of alias is not found.