[Java] [Cosmetic]: 1. regenerated the SBE-IR classes after #166 and suppress an extra new line from JavaGenerator.
2. added .apt_generated and .factorypath to .gitignore (these resources are used by the annotation processor configured in eclipse - jmh in our case)
3. cleaned up some warnings (generics, try-with-resource, unused variables)
Merge pull request #168 from csoroiu/master

[Java] [Cosmetic]: 1. regenerated the SBE-IR classes after #166 and ...
[Java]: Code style changes.