Initial.
Extracted AL and MP modules.
Added lambda scopes support.
Added rake tasks to build and publish gem.
Added #move_children_to_parent.
Fixed Rakefile.
Version 0.1.0.
Fixed lambda scopes.
Updated dependencies.
Updated description.
Version 0.1.1.
Changed root behaviour.

- Added root association.
- Added #root_id.
- Added #root_of?
- Added #parent_of?
Version 0.1.2.
"orphan_strategy" option renamed to "dependent".
Added counter cache specs.
Added #leaf?
Added root association specs.
Updated changelog.
Updated codestyle.
Updated .gitignore.