Rename Binding to Meme

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extra : amend_source : e478ab8d81f1c318b805b5e8d77e1e2f448af339
Show Rubinius-style backtrace in sandbox
Make AST::DeclareObject and AST::DeclareMeme more idiomatic as Rubinius AST nodes and improve integration

--HG--
extra : amend_source : 88484ee1bf235270ee0f4e76f8e3bc56837b3aa7