fix set descendant class
Fixed #566, #568.
Since "package" is actually a file path, it should be able to contain dashes.
Changed the xsd database>package data type to `file` and adapted simple type `file` to allow them to contain dashes.
Added a test for it.
Added `-` to the xsd simple type `file` comment.
unit test
Merge pull request #570 from MArcJ/master

Fixed #566, #568. Dashes in xsd database>package.
fixed file description
inverted actual and expected values
Just added a new test that should proves the behavior explained in propelorm/Propel#533.
Removed tabs.
Merge pull request #571 from MArcJ/master

Just added a new test that should proves the behavior explained in #533.
Update runtime/lib/om/BaseObject.php

fixed typo
Merge pull request #575 from staabm/patch-1

Update runtime/lib/om/BaseObject.php
Merge pull request #569 from nibsirahsieu/fix_set_descendant_class

fix set descendant class