Revert "chef 10: remove unused recipes with errors"

Now we need these.

This reverts commit 76d5126e0e0cc8f58aee8107446591533f40c54b.

Conflicts:
	cookbooks/mongodb/README.md
	cookbooks/mongodb/recipes/default.rb
	cookbooks/mongodb/templates/default/mongo-backup.rb.erb
	cookbooks/postgresql9_extensions/definitions/load_sql_file.rb
	cookbooks/postgresql9_extensions/definitions/postgis.rb
	cookbooks/postgresql9_extensions/definitions/postgis2.rb
Cleanup deleted files that were readied during revert.