Reorganize experimental stuff.

• experimentation/experiments/erubis.rb
• experimentation/internal_benches/responder.rb
• experimentation/simple_benches/array.rb
• experimentation/simple_benches/caller.rb
• experimentation/simple_benches/define_method.rb
• experimentation/simple_benches/empty.rb
• experimentation/simple_benches/erb_erubis.rb
• experimentation/simple_benches/erubis.rb
• experimentation/simple_benches/eval_literal.rb
• experimentation/simple_benches/functor.rb
• experimentation/simple_benches/hash_assoc.rb
• experimentation/simple_benches/imethod_exists.rb
• experimentation/simple_benches/index.rb
• experimentation/simple_benches/inflector.rb
• experimentation/simple_benches/inline.rb
• experimentation/simple_benches/instantiate.rb
• experimentation/simple_benches/lots_of_method.rb
• experimentation/simple_benches/new_array.rb
• experimentation/simple_benches/one_line.rb
• experimentation/simple_benches/preprocess.rb
• experimentation/simple_benches/proc_eval_gsub.rb
• experimentation/simple_benches/questioneer.rb
• experimentation/simple_benches/responder_syns.rb
• experimentation/simple_benches/set_hash.rb
• experimentation/simple_benches/split_capture.rb
• experimentation/simple_benches/split_gsub.rb
• experimentation/simple_benches/squeeze.rb
• experimentation/simple_benches/string_begin.rb
• experimentation/simple_benches/string_eq.rb
• experimentation/simple_benches/to_proc.rb
• internal_benches/responder.rb
• simple_benches/array.rb
• simple_benches/define_method.rb
• simple_benches/empty.rb
• simple_benches/erubis.rb
• simple_benches/eval_literal.rb
• simple_benches/functor.rb
• simple_benches/hash_assoc.rb
• simple_benches/imethod_exists.rb
• simple_benches/index.rb
• simple_benches/inflector.rb
• simple_benches/instantiate.rb
• simple_benches/lots_of_method.rb
• simple_benches/new_array.rb
• simple_benches/one_line.rb
• simple_benches/proc_eval_gsub.rb
• simple_benches/responder_syns.rb
• simple_benches/set_hash.rb
• simple_benches/split_capture.rb
• simple_benches/split_gsub.rb
• simple_benches/squeeze.rb
• simple_benches/string_begin.rb
• simple_benches/string_eq.rb
• simple_benches/to_proc.rb