No findByXXX on primary keys with multiple columns

[moufmouf]

When using a primary key with multiple columns, the getById method is not generated (that's ok), but the findOneByXXXAndYYY method is not generated.
It would be better to generate it.

[moufmouf]

Note: we should NOT generate a findOneByXXXAndYYY but instead generate a getById($xxx, $yyy)

[moufmouf]

@homersimpsons