[phobos] [D-Programming-Language/phobos] 621765: Revert "Add new lazy range: merge()"

[GitHub via phobos]

  Branch: refs/heads/revert-3315-add-merge-range
  Home:   https://github.com/D-Programming-Language/phobos
  Commit: 621765d88fe8eb592d20dfee1b480a674116089d
      https://github.com/D-Programming-Language/phobos/commit/621765d88fe8eb592d20dfee1b480a674116089d
  Author: Vladimir Panteleev <github.private at thecybershadow.net>
  Date:   2015-06-28 (Sun, 28 Jun 2015)

  Changed paths:
    M std/range/package.d

  Log Message:
  -----------
  Revert "Add new lazy range: merge()"