Fix demo package exclude
Add spec for DELETE processing
Implement DELETE statements
 - except for DELETE statements with both LIMIT and WHERE clauses
Start on spec for INSERT statements
Add spec for inserts with the wrong number of values
Expect exceptions the correct way in tests
INSERT processing detects wrong number of values
Start trying to make INSERT typechecking work
Implement (simple) INSERT statements
 + Had to change the parser to only parse INSERTs with literals (but I don't think that's a problem)
 + Type checking sort of works (It will probably generate some kind of exception if types don't match, but it may not be handled in a pretty way yet)
Merge remote-tracking branch 'origin/master'