Fix build break because of unsigned/signed mismatch
Merge pull request #371 from dlezama/master

Fix build break because of unsigned/signed mismatch
BlockBasedTableConfig & PlainTableConfig enhancements

Summary:
BlockBasedTableConfig
- ported Checksum
- ported IndexType

PlainTableConfig
- added missing options
- added EncodingType

Test Plan:
make rocksdbjava
make jtest

Differential Revision: https://reviews.facebook.net/D26595
Integrated review comments by ankgup87

- Added tests
- Minor code-style changes
[RocksJava] Integrate review comments from yhchiang
Merge pull request #356 from fyrz/RocksJava-TableOptions-3.6

[RocksJava] BlockBasedTableConfig & PlainTableConfig enhancements