[Rails3] Better Gemfile so we can "bundle install" on all ruby platforms correctly.

Author: metaskills

Gemfile

@@ -3,8 +3,10 @@ source :rubygems
 gemspec :path => ENV['RAILS_SOURCE']
 
 group :development do
-  gem 'rake'
-  gem 'mocha', '0.9.8'
-  gem 'shoulda', '2.10.3'
-  gem 'ruby-debug', '0.10.3'
+  gem 'rake', '>= 0.8.7'
+  gem 'mocha', '>= 0.9.8'
+  gem 'shoulda', '>= 2.10.3'
+  platforms :mri_18 do
+    gem "ruby-debug", ">= 0.10.3"
+  end
 end