Prevent illegal offset warnings FQCN

[hiddeco]

#124

[xabbuh]

Can you expand the tests with an example that would fail without your patch?

[hiddeco]

@xabbuh not very easy to test as the FullQualified node class has a __toString() method which is picked up almost everywhere except when it's used as an array key. So the 'valid' results from the emitter will only cause problems 2-3 steps later.

Everything would however fail if we made string assertions for $classA and $classB in the Dependency constructor.

[timglabisch]

this should help to prevent such issues: https://github.com/sensiolabs-de/deptrac/blob/master/Makefile#L19

@hiddeco thanks a lot =)