Define GITORIOUS_HOST only once

lib/gitlab/gitorious_import.rb

+module Gitlab
+  module GitoriousImport
+    GITORIOUS_HOST = "https://gitorious.org"
+  end
+end

lib/gitlab/gitorious_import/client.rb

 module Gitlab
   module GitoriousImport
-    GITORIOUS_HOST = "https://gitorious.org"
-
     class Client
       attr_reader :repo_list

lib/gitlab/gitorious_import/repository.rb

 module Gitlab
   module GitoriousImport
-    GITORIOUS_HOST = "https://gitorious.org"
-    
     Repository = Struct.new(:full_name) do
       def id
         Digest::SHA1.hexdigest(full_name)