Add reproducer for MODELLO-284
[MODELLO-284] Fix handling of Boolean fields in StAX reader
Add reproducer for MODELLO-285
[MODELLO-285] Fix StAX reader in case no field adder is defined

In generated StAX readers don't use adders for fields which have
adders explicitly disabled.
Merge pull request #16 from mizdebsk/master

Fix MODELLO-284 and MODELLO-285