* array.c (rb_ary_sample): rename #choice to #sample.  in
	  addition, sample takes optional argument, a la #first.
	* random.c (Init_Random): always initialize seed.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8_7@21617 b2dd03c8-39d4-4d8f-98ff-823fe69b080e