update gem dependencies

Signed-off-by: José Valim <jose.valim@gmail.com>

Gemfile

@@ -1,7 +1,7 @@
 source "http://gemcutter.org"
 
 # Need to install Rails from source
-gem "rails", "3.0.0.beta1"
+gem "rails", "3.0.0.beta1", :git => "git://github.com/rails/rails.git"
 gem "warden", "0.9.7"
 gem "sqlite3-ruby", :require => "sqlite3"
 gem "webrat", "0.7"
@@ -15,5 +15,5 @@ end
 group :mongo_mapper do
   gem "mongo",        "0.18.3"
   gem "mongo_ext",    "0.18.3", :require => false
-  gem "mongo_mapper", :git => "git://github.com/merbjedi/mongomapper.git", :branch => "rails3"
+  gem "mongo_mapper-rails3", :git => "git://github.com/merbjedi/mongomapper.git", :branch => "rails3"
 end