Serve rebar without https, closes #2152

Author: José Valim

lib/elixir/lib/stream.ex

@@ -81,6 +81,12 @@ defmodule Stream do
 
   This module also provides many convenience functions for creating streams,
   like `Stream.cycle/1`, `Stream.unfold/2`, `Stream.resource/3` and more.
+
+  Note the functions in this module are guaranteed to return enumerables.
+  Since enumerables can have different shapes (structs, anonymous functions,
+  and so on), the functions in this module may return any of those shapes
+  and that it may change at any time. For example, a function that today
+  returns an anonymous function may return a struct in future releases.
   """
 
   defrecord Lazy, enum: nil, funs: [], accs: [], done: nil

lib/mix/lib/mix/tasks/local.rebar.ex

@@ -3,7 +3,7 @@ defmodule Mix.Tasks.Local.Rebar do
 
   import Mix.Generator, only: [create_file: 2]
 
-  @rebar_url "https://github.com/elixir-lang/elixir/raw/3cf4c21ad1f4627585b80394c37ac9f4d39d3aa8/rebar"
+  @rebar_url "http://elixir-lang.org/rebar"
   @shortdoc  "Install rebar locally"
 
   @moduledoc """