* array.c (rb_ary_combination): new method to give all combination

  of elements from an array.  [ruby-list:42671]

* array.c (rb_ary_product): a new method to get all combinations
  of elements from two arrays.  can be extended to combinations of
  n-arrays, e.g. a.product(b,c,d).  anyone volunteer?

* array.c (rb_ary_permutation): empty function body to calculate
  permutations of array elements.  need volunteer.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@13568 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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