Remove headings from examples
Mark rake/pathmap for removal in Rake 11
Document rake/phony in doc/rakefile.rdoc
Hide Rake::Win32 from documentation
Hide Rake::TraceOutput from documentation
Hide Rake::ThreadPool from documentation
Hide some TestTask methods from documentation
Mark TaskLib#paste for removal in Rake 11
Hide methods in TaskManager from documentation
Improve TaskArguments documentation
Hide Task methods from documentation
Hide Rake::Backtrace from documentation
Hide Scope from documentation