Add specs for Integer#truncate that takes optional digits
Add specs for Integer#truncate that takes optional digits

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