allow nullable in lazy attributes
moved nullable inside, decided to leave all @Override on a separate line for now
Fixes to resolve multiple inherited accessor generation.
#57
wip. naming and model customization infrastructure being developed
wip. upgraded model and Immutables.generator changed for styles
wip. added compile tests, moving closer
add processing of imports block
Merge branch 'namings' of https://github.com/immutables/immutables into postprocessor