[phobos] [D-Programming-Language/phobos] fa8c4f: Add missing imports

[GitHub via phobos]

  Branch: refs/heads/master
  Home:   https://github.com/D-Programming-Language/phobos
  Commit: fa8c4f3280cc1c6cb17e8606ef181563d7b92d25
      https://github.com/D-Programming-Language/phobos/commit/fa8c4f3280cc1c6cb17e8606ef181563d7b92d25
  Author: k-hara <k.hara.pg at gmail.com>
  Date:   2014-06-28 (Sat, 28 Jun 2014)

  Changed paths:
    M std/container/binaryheap.d
    M std/container/dlist.d
    M std/container/rbtree.d
    M std/container/slist.d

  Log Message:
  -----------
  Add missing imports


  Commit: 950d67af6a6649f0fd1fb3b1004727c19da9ccfb
      https://github.com/D-Programming-Language/phobos/commit/950d67af6a6649f0fd1fb3b1004727c19da9ccfb
  Author: monarch dodra <monarchdodra at gmail.com>
  Date:   2014-06-28 (Sat, 28 Jun 2014)

  Changed paths:
    M std/container/binaryheap.d
    M std/container/dlist.d
    M std/container/rbtree.d
    M std/container/slist.d

  Log Message:
  -----------
  Merge pull request #2280 from 9rnsr/fix12359

Add missing imports


Compare: https://github.com/D-Programming-Language/phobos/compare/19fa794617fc...950d67af6a66