Update to not need special code for :branch (thanks JK)

lib/bundler/source.rb

@@ -268,7 +268,6 @@ class Git < Path
       def initialize(options)
         super
         @uri    = options["uri"]
-        @branch = options["branch"] || "master"
         @ref    = options["ref"] || options["branch"] || options["tag"] || 'master'
       end
 
@@ -345,7 +344,7 @@ def cache_path
       def cache
         if cached?
           Bundler.ui.info "Updating #{uri}"
-          in_cache { git %|fetch --quiet "#{uri}" #{@branch}:#{@branch}| }
+          in_cache { git %|fetch --quiet "#{uri}" refs/heads/*:refs/heads/*| }
         else
           Bundler.ui.info "Fetching #{uri}"
           FileUtils.mkdir_p(cache_path.dirname)

spec/support/builders.rb

@@ -371,16 +371,27 @@ def _build(options)
     end
 
     class GitUpdater < LibBuilder
+      WINDOWS = Config::CONFIG["host_os"] =~ %r!(msdos|mswin|djgpp|mingw)!
+      NULL    = WINDOWS ? "NUL" : "/dev/null"
+
+      def silently(str)
+        `#{str} 2>#{NULL}`
+      end
+
       def _build(options)
         libpath = options[:path] || _default_path
 
         Dir.chdir(libpath) do
-          `git checkout master`
+          silently "git checkout master"
 
           if branch = options[:branch]
             raise "You can't specify `master` as the branch" if branch == "master"
-            `git branch #{branch}` unless `git branch | grep #{branch}`.any?
-            `git checkout #{branch}`
+
+            unless `git branch | grep #{branch}`.any?
+              silently("git branch #{branch}")
+            end
+
+            silently("git checkout #{branch}")
           end
 
           current_ref = `git rev-parse HEAD`.strip