Revert "Revert "Bump bundler to 1.0.0.beta.3""

It's out for reals!

This reverts commit 951dbf06.

rails.gemspec

@@ -25,5 +25,5 @@
   s.add_dependency('activeresource', version)
   s.add_dependency('actionmailer',   version)
   s.add_dependency('railties',       version)
-  s.add_dependency('bundler',        '>= 1.0.0.beta.2')
+  s.add_dependency('bundler',        '>= 1.0.0.beta.3')
 end