Add File.birthtime and File#birthtime specs
Add File.birthtime and File#birthtime specs

wied03/rubyspec,eregon/rubyspec,ruby/spec,nobu/rubyspec,ruby/spec,wied03/rubyspec,ruby/rubyspec,nobu/rubyspec,sgarciac/spec,nobu/rubyspec,kachick/rubyspec,eregon/rubyspec,kachick/rubyspec,sgarciac/spec,kachick/rubyspec,wied03/rubyspec,BanzaiMan/rubyspec,eregon/rubyspec,sgarciac/spec,ruby/rubyspec,ruby/spec,BanzaiMan/rubyspec