[Ironruby-core] Code Review: MiscFixes.2

[Tomas Matousek]

  tfpt review "/shelveset:MiscFixes.2;REDMOND\tomat"
  Comment  : 
  (MiscFixes.2)
  
  Fixes bugs:
  -	Protocols.IsEqual should compare references first before calling == method.
  -	Exception#initialize should reset backtrace to nil.
  -	Exception#exception should not be special-cased for argument == self (filed Ruby bug http://redmine.ruby-lang.org/issues/show/1248)
  -	Fixnum#<< handled overflow incorrectly.
  -	System::String inspect uses single quotes instead of double quotes to differentiate from Ruby string.
  -	Fixes L conversion in Array#unpack.
  
  Adds RubyMetaObject and RubyMetaObject<T> to handle functionality common for Ruby meta-objects and derives Proc.Meta and Method.Meta from RMO<T> (more refactoring will follow).
  Implements a conversion from Proc/Method to an arbitrary delegate.
  Slightly refactors meta-object builder. More changes will follow.

Tomas
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