fixed #27 when database prefix led to wrong closure table name
Merge branch '2.0' of https://github.com/franzose/ClosureTable into 2.0
fixed typo in DB::getTablePrefix() method call
added another test for moveTo()
fixed #32, position is the fillable now
Added language inserts to all tests

This fixes a part of the errors that i got running phpunit since
'language' is not nullable.
Merge branch '2.0' of https://github.com/vjandrea/ClosureTable into 2.0