Updated gems Rakefile's for CI.

* Changed 'install' task to use sudo unless the
  SUDOLESS environmental variable is set.
* Updated merb_datamapper 'spec' task to look for
  specs in the 'spec' folder.

Rakefile

@@ -34,7 +34,7 @@ Rake::GemPackageTask.new(spec) do |pkg|
 end
 
 task :install => [:package] do
-  sh %{sudo gem install pkg/#{NAME}-#{VERSION} --no-update-sources}
+  sh %{#{'sudo' unless ENV['SUDOLESS']} gem install pkg/#{NAME}-#{VERSION} --no-update-sources}
 end
 
 desc "Run specifications"