Add Array#concat with multiple arguments
Add Array#concat with multiple arguments

eregon/rubyspec,sgarciac/spec,eregon/rubyspec,eregon/rubyspec,sgarciac/spec,ruby/rubyspec,nobu/rubyspec,nobu/rubyspec,ruby/spec,ruby/spec,nobu/rubyspec,ruby/spec,ruby/rubyspec,sgarciac/spec