First implementation of the subtrees

See #19, release log:

• 9b9b2c5 by @kniazkov: Update contrubutors list
• 9c74e2b by @kniazkov: Update version info.java
• b4b0ef8 by @kniazkov: Merge pull request #19 from Gi...
• 7277753 by @kniazkov: Moar tests
• c524364 by @kniazkov: Node selector and one test for...
• 60b5f8e by @kniazkov: Small refactoring
• a29f533 by @kniazkov: Merge pull request #18 from kn...
• 6183ac2 by @kniazkov: Remove old test
• bcad2a4 by @kniazkov: Enable old test, added another...
• 7695e4a by @kniazkov: + test
• acacb1e by @kniazkov: + test
• 203568b by @kniazkov: + test
• 3de1c16 by @kniazkov: + test
• 5ae3a1b by @kniazkov: Top-down mapper: implement map...
• 7d24185 by @kniazkov: Remove old mapping algorithm
• dd04a89 by @kniazkov: Top-down mapper: perform "Repl...
• 78e94be by @kniazkov: Top-down mapper: implement map...
• e640014 by @kniazkov: Disable added test
• 3da3d3b by @kniazkov: + test
• 5d2fadf: Adjustments according to MR co...
• and 12 more...

Released by Rultor 2.0-SNAPSHOT, see build log