这个版本有很多的改进以及对上一个版本的bug进行修复，包括：
* 5 Major Enhancements
* More extensive unit tests (special thanks to Chris Lowis for contributing
a test).
* Made ri twice as fast for the most common use case of displaying
information for a class or a fully-qualified method
(i.e., ri Array#flatten, after ri has created a cache the first time that
it runs).
* Made ri many times faster when searching for an unqualified method (i.e.,
ri read, again after the first such search has populated ri's cache)
* Changed ri to do regular expression searches for unqualified methods;
now, a regular expression for a method can be passed to ri on the
command-line.
* Added an interactive mode to ri (patch by Daniel Choi). Now, when ri
is given a -i argument, it will allow the user to disambiguate
unqualified methods if more than one is present and also will allow a
user to get information for a class' method.
* 8 Minor Enhancements
* RDoc now adds the package title to the web pages that it generates
for files and classes/modules, which helps them appear better in
search engine results.
* RDoc now automatically generates cross-reference links for classes and
methods specified relative to the global namespace (i.e., ::A::B::C#method).
* All built-in templates now output valid, strict XHTML.
* The documentation is slightly better organized (the markup details were
merged into the RDoc module's documentation).
* Improved rdoc's HTML generation speed by about 20% (on Windows, the
boost seems larger).
* Provided an ri command-line option to control its caching behavior.
* Improved RDoc's documentation. Added RI.txt to document ri.
* Allow HTML templates distributed as gems to be loaded with the -T option,
just like the standard templates in rdoc/generator/html (so an HTML
template lib/new_template.rb in a gem can be used with rdoc -T new_template)
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