Merge pull request #2 from franzose/2.0

2.0
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
Merge pull request #35 from vjandrea/2.0

Added language inserts to all tests that didn't have them.