clean up rake and gem files

Gemfile

@@ -2,9 +2,9 @@ source "http://rubygems.org"
 
 # Specify your gem's dependencies in guard-rails.gemspec
 gemspec
-gem 'rake', '0.8.7'
+gem 'rake'
 gem 'fakefs', :require => nil
-gem 'guard', :git => 'https://github.com/guard/guard.git'
+gem 'guard'
 gem 'guard-rspec'
 
 require 'rbconfig'

Rakefile

@@ -15,23 +15,10 @@ RSpec::Core::RakeTask.new(:spec)
 namespace :spec do
   desc "Run on three Rubies"
   task :platforms do
-    current = %x{rvm-prompt v}
-    
-    fail = false
-    %w{1.8.7 1.9.2 ree}.each do |version|
-      puts "Switching to #{version}"
-      Bundler.with_clean_env do
-        system %{bash -c 'source ~/.rvm/scripts/rvm && rvm #{version} && bundle exec rake spec'}
-      end
-      if $?.exitstatus != 0
-        fail = true
-        break
-      end
-    end
-
-    system %{rvm #{current}}
-
-    exit (fail ? 1 : 0)
+    prefix = "rvm 1.8.7,1.9.2,ree ruby"
+    system %{#{prefix} bundle}
+    system %{#{prefix} bundle exec rake spec}
+    exit $?.exitstatus
   end
 end