* lib/delegate.rb (Delegator#send): override to get rid of global function interference.
[Fixes GH-449]
* lib/delegate.rb (Delegator#send): separate from method_missing so
that super calls proper method.
* lib/delegate.rb (Delegator#method_missing): try private methods defined in
Kernel after the target. [Fixes GH-449]
* lib/delegate.rb (SimpleDelegator#__getobj__): target object must be set.
* lib/delegate.rb (DelegateClass#__getobj__): ditto.
merge revision(s) 43682,43727,43752,43759: [Backport #9560]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@45747 b2dd03c8-39d4-4d8f-98ff-823fe69b080e