* lib/rubygems: Update to RubyGems 2.1.3

Fixed installing platform gems

  Restored concurrent requires

  Fixed installing gems with extensions with --install-dir

  Fixed `gem fetch -v` to install the latest version

  Fixed installing gems with "./" in their files entries

* test/rubygems/test_gem_package.rb:  Tests for the above.

* NEWS:  Updated for RubyGems 2.1.3


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42938 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/rubygems/source_specific_file.rb

@@ -1,4 +1,28 @@
-require 'rubygems/source/specific_file'
+class Gem::Source::SpecificFile < Gem::Source
+  def initialize(file)
+    @uri = nil
+    @path = ::File.expand_path(file)
 
-# TODO warn upon require, this file is deprecated.
+    @package = Gem::Package.new @path
+    @spec = @package.spec
+    @name = @spec.name_tuple
+  end
 
+  attr_reader :spec
+
+  def load_specs(*a)
+    [@name]
+  end
+
+  def fetch_spec(name)
+    return @spec if name == @name
+    raise Gem::Exception, "Unable to find '#{name}'"
+    @spec
+  end
+
+  def download(spec, dir=nil)
+    return @path if spec == @spec
+    raise Gem::Exception, "Unable to download '#{spec.full_name}'"
+  end
+
+end