added nice to have - rake task and some changes to docs

doc/README.md

@@ -7,6 +7,7 @@
 - [GitLab as OAuth2 authentication service provider](integration/oauth_provider.md). It allows you to login to other applications from GitLab.
 - [GitLab Basics](gitlab-basics/README.md) Find step by step how to start working on your commandline and on GitLab.
 - [Importing to GitLab](workflow/importing/README.md).
+- [Importing and exporting projects between instances](workflow/import_export/README.md).
 - [Markdown](markdown/markdown.md) GitLab's advanced formatting system.
 - [Migrating from SVN](workflow/importing/migrating_from_svn.md) Convert a SVN repository to Git and GitLab
 - [Permissions](permissions/permissions.md) Learn what each role in a project (external/guest/reporter/developer/master/owner) can do.

doc/administration/import_export.md → doc/workflow/import_export/README.md

 # Project import/export
 
 Existing projects running on any GitLab instance or GitLab.com can be exported
-with all its related data and be moved to a new GitLab instance.
+with all its related data and be moved into a new GitLab instance.
 
 >**Note:** 
   - This feature was [introduced][ce-3050] in GitLab 8.9
@@ -51,14 +51,14 @@ can be generated again
 
 ## Advanced
 
-> The GitLab Import/Export version can be checked by using:
+The GitLab Import/Export version can be checked by using:
 
 ```bash
 cd /home/git/gitlab
-sudo -u git -H bundle exec rake gitlab:import_export:version
+sudo -u git -H bundle exec rake gitlab:import_export:version RAILS_ENV=production
 ```
 
-> The current list of DB tables that will get exported can be listed by using:
+The current list of DB tables that will get exported can be listed by using:
 
 ```bash
 cd /home/git/gitlab

lib/tasks/gitlab/import_export.rake

+namespace :gitlab do
+  namespace :import_export do
+    desc "GitLab | Show Import/Export version"
+    task version: :environment do
+      puts "Import/Export v#{Gitlab::ImportExport.version}"
+    end
+
+    desc "GitLab | Display exported DB structure"
+    task data: :environment do
+      puts YAML.load_file(Gitlab::ImportExport.config_file)['project_tree'].to_yaml(:SortKeys => true)
+    end
+  end
+end