Snip formatting for documents causing serious lag

[Redsandro]

This fixes extreme lag on long documents as discussed in issue #9

[getvega]

Thanks for this fix! Helped a lot.

[iwind]

1.1.6 will bring

• docs_nature_order: http://rockmongo.com/wiki/configuration?lang=en_us#%23%23%23%23docs_nature_order%0D
• docs_render: http://rockmongo.com/wiki/configuration?lang=en_us#%23%23%23%23docs_render%0D

Just specify docs_render="plain", will do the work.

[Redsandro]

This fix is deprecated by #58