[Java] Add compaction style to options

Summary:
Add compression type to options

make rocksdbjava
make sample

Reviewers: haobo, yhchiang, sdong, dhruba, rsumbaly, zzbennett, swapnilghike
Reviewed By: yhchiang, sdong
CC: leveldb

Differential Revision: https://reviews.facebook.net/D20463

java/org/rocksdb/RocksDB.java

@@ -119,7 +119,6 @@ public class RocksDB extends RocksObject {
             options.numShardBits_, path);
     
     db.storeOptionsInstance(options);
-    
     return db;
   }