* lib/set.rb (Set#delete_if): Call to_a.
	  (SortedSet#delete_if, TC_SortedSet#test_sortedset): Use super to
	  yield elements in sorted order; [ruby-core:17144] by Arthur
	  Schreiber.
	  (SortedSet#each, SortedSet#each, TC_Set#test_each)
	  (TC_SortedSet#test_sortedset): Return self; [ruby-dev:35002] by
	  Arthur Schreiber.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8_6@17648 b2dd03c8-39d4-4d8f-98ff-823fe69b080e