New feature: Added config for Mango class
New feature: Added initial Mango Exception class
Updated translation: Amended Russian
New feature: Added Mango class (new version). WIP

It's a complete class replacement for Mango Reader module.

   Warning: TEMPORARY DO NOT USE Mango Reader module!!!

This class will be used to for full access to the sessions, logs,
and other data to improve performance. I have provided a detailed
description of the class in the form of PHPDoc comments.
Please read them initially.

Todo: Mango_Collection
      Mango_Document
      GridFS support

      Log Reader/Writer
      Session Reader/Writer
      Cache Reader/Writer
Merge pull request #424 from sergeyklay/master

MongoDB support. WIP