Use diaspora gemset. Simplify rake runner.

cruise_config.rb

 require 'fileutils'
 
 Project.configure do |project|
-  project.build_command = 'source /usr/local/rvm/scripts/rvm && rvm use ruby-1.8.7-p249 && gem update --system && ruby lib/cruise/build.rb'
+  project.build_command = 'source /usr/local/rvm/scripts/rvm && rvm use ruby-1.8.7-p249@diaspora && gem update --system && ruby lib/cruise/build.rb'
 end

lib/cruise/build.rb

@@ -8,7 +8,7 @@ end
 
 def rake(*tasks)
   tasks.each do |task|
-    return false unless system("#{root_dir}/bin/rake", task, 'RAILS_ENV=test')
+    return false unless system("rake", task, 'RAILS_ENV=test')
   end
 end