report superclass in documentation - first stab
Implement suggestions according to #115 commentary:

* find_superclass_method searches ancestry for the appropriate method
* Methods, not Classes, are now linked.
* Bold highlighting + some other niceties in formatting
list indication of superclass methods.
tests for find_superclass_method
tests for AnyMethod#uses_superclass seeding
add the arrow_up.png icon + update css for superclass methods
ri support for superclass indicators - UPDATES MARSHAL FORMAT
Add support for documenting class/module extensions

--HG--
rename : lib/rdoc/include.rb => lib/rdoc/extend.rb
rename : test/test_rdoc_include.rb => test/test_rdoc_extend.rb
Fix accidentally-committed keyword changes and generated files.
Finish up documentation for class/module extensions.

--HG--
rename : lib/rdoc/generator/template/darkfish/_sidebar_includes.rhtml => lib/rdoc/generator/template/darkfish/_sidebar_extends.rhtml
Merge pull request #115 from erikh/superclass_report

Methods that use super are now shown in rdoc HTML view
Updated Manifest for #115
Updated Manifest for #115
find_superclass_method is now lazy.
fix for ri driver -- RDoc::Markup::List does not have a #concat method.
Fixes for tests; I had forgotten how superclass_method worked.
Merge branch 'master' into ri_superclass
Fixed syntax highlighting of regular expressions

In HTML output, syntax highlighting of regular expressions could become
corrupted.  This patch whitelists "/" as a character with a matching
terminal like '"' and "'" for strings.

See also Ruby Bug #6488 and #6523
Fixed Regexp backreference corruption

Regular expression parsing was switched to use single-quote escaping
rules.  Using double quote rules, extra backslashes and white spaces was
added.

See also Ruby Bug #6488 and #6523
skip Object class when calculating RDoc::Stats for coverage report #127