With the last commit a Test was accidentally disabled. This commit solves this.
Merge pull request #350 from fyrz/reenable_accidentally_disabled_test

[RocksJava] Options-Test was accidentally disabled
[RocksJava] Support Snapshots

Snapshots integration into RocksJava. Added support for the following functionalities:

- getSnapshot
- releaseSnapshot
- ReadOptions support to set a Snapshot
- ReadOptions support to retrieve Snapshot
- SnapshotTest