Allow tests to run without jeweler.

Index: Rakefile
--- Rakefile.orig
+++ Rakefile
@@ -35,7 +35,6 @@ begin
   end
   Jeweler::GemcutterTasks.new
 rescue LoadError
-  puts "Jeweler (or a dependency) not available. Install it with: sudo gem install jeweler"
 end
 
 require 'rake/testtask'