Log Message:
Update rdoc package to 4.2.0.

=== 4.2.0 / 2014-12-06

* Major enhancements
  * RDoc can now produce translation files for use with gettext.  See
    RDoc::Generator::POT for a workflow for creating translations of your
    documentation.  Pull request #254 by Kouhei Sutou.

* Minor enhancements
  * RDoc now allows any single-word macro before a C method implementation.
    Issue #722 by Hanmac.
  * Now :all is a synonym for :private for RDoc::Options#visibility= to match
    the --all command line option.  Pull request #276 by Zachary Scott.
  * Running rake for the first time now installs racc.  Pull request #285 by
    Kouhei Sutou.
  * Added <code>-h</code> flag to also display help.  Issue #300 by \ 
Ryan Davis
  * search_index.js is now loaded asynchronously for improved performance.
  * Allow +X::Y+ as typewriter text.  Issue #319, pull request #322 by Jeremy
    Evans.
  * Added RDoc::RI::Task for building ri data easily through rake.  Pull
    request #332 by Zachary Scott.
  * A gzipped search index is generated for servers configured to use
    precompressed files.  Pull request #334 by Zachary Scott.
  * CSS files now live under /css relative to the document root.  Pull request
    #335 by Zachary Scott.
  * Improved detection of valid ruby in verbatim sections.  Pull request #333
    by Jeremy Evans.

* Bug fixes
  * Fixed HTML labels for cross-browser compatibility.  This breaks existing
    links but enables cross-browser compatibility.  Pull request #330 by Jens
    Wille.
  * RDoc handles ASCII-incompatible encodings now.  An encoding hint may need
    to be added to the file for RDoc to produce correct output, though.
    Issue #288 by Manuel Meurer.
  * Fixed height recalculation issues when headings are hovered.  Issue #289
    by Dietmar H. Büto.
  * RDoc now ignores its own output directories.  Pull Request #306 by
    Hsing-Hui Hsu, bug #305 by Ryan Davis.
  * Fixed RDoc::Task no longer uselessly builds documentation when generating
    non-HTML output.  Bug #307 by Christina Thompson, pull request #308 by
    Hsing-Hui Hsu
  * Added pointer to font copyright and license information to LEGAL.rdoc.
    Issue #290 by Christian Hofstaedtler.
  * Fixed RDoc::Context#<=> for ruby trunk.  Issue #284 by Hanmac, pull
    request #287 by Aaron Patterson
  * Tests no longer create directories inside test/.  Pull request #286 by
    Kouhei Sutou.
  * Fixed documentation example in RDoc::Markup.  Pull request #292 by Gregory
    Brown.
  * Applied typo fix to RDoc::Markup. Pull request #297 by @montanalow
  * Fixed pretty_print for RDoc::MethodAttr with an alias.  Pull request #324
    by Hsing-Hui Hsu.
  * Fixed lexing of %w"".  Issue #315 by Thierry Lambert, pull request \ 
#323 by
    Jeremy Evans.
  * RDoc::TokenStream now removes nil tokens.  Pull request #318 by Calle
    Erlandsson.
  * Fixed footer links to rubyforge and darkfish.  Pull request #328 by
    @blackwinter
  * Fixed page-top link.  Pull request #329 by @blackwinter
  * Minitest gem activation failures are now ignored during test startup.
    Issue #313 by Vít Ondruch.
  * Fixed error when generating documentation from singleton classes.  Issue
    #311 by Vít Ondruch.
  * Splat and keyword params can now be detected for documentation
    completeness.  Issue #321 Tom Kadwill.
  * Standalone anchors in markdown documents are no longer escaped.  Issue
    #312 by Scott Thompson.
  * Fixed RegExp matching stack overflow on Ruby 1.8.7.  Issue #327 by sshao.

=== 4.1.2 / 2014-09-05

* Bug fixes
  * Updated vendored jQuery to 1.6.4.  Bug ruby/ruby#711 by @neuralme