Add specs for Binding#receiver
Add specs for Binding#receiver

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