Add Date#friday? spec
Add Date#friday? spec

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