MOS-939, MOS-940

See #16, release log:

• c1521ce by @kniazkov: Merge pull request #16 from kn...
• 544a46d by @kniazkov: Test for top-down mapper
• 755d78f by @kniazkov: Top-down mapper (draft)
• ca17544 by @kniazkov: Trying to mapping unmapped nod...
• 050c388 by @kniazkov: Move draft mapping to separate...
• 1a60e3b by @kniazkov: Added test that not passed

Released by Rultor 2.0-SNAPSHOT, see build log