Updated the Rakefile to use the correct init code.

Rakefile

@@ -6,7 +6,14 @@ version = `cat version.txt`.gsub(/\n/, "")
 
 task :default => :jquery
 
-task :jquery => [:selector] do
+task :init do
+	sh "if test ! -d test/qunit; then git clone git://github.com/jquery/qunit.git test/qunit; fi"
+	sh "if test ! -d src/sizzle; then git clone git://github.com/jeresig/sizzle.git src/sizzle; fi"
+	sh "cd src/sizzle && git pull origin master &> /dev/null"
+	sh "cd test/qunit && git pull origin master &> /dev/null"
+end
+
+task :jquery => [:init, :selector] do
 	sh "mkdir -p dist"
 
 	sh "cat " + files.map {|file| "src/" + file + ".js"}.join(" ") +