fixed errors while creating new Entity via create() method
fixed misconfigure that broke all tests
fixed wrong siblingAt behaviour
removed erroneous caching of closure table attributes, changed reorderSiblings() query to be valid for SQLite
rewriting tests
Merge branch '2.0' of https://github.com/franzose/ClosureTable into 2.0
fix #10 and various other bugs
Merge pull request #11 from franzose/2.0

Fixed various bugs.