RocksDB merging in golang

tools/merge/f1/000030.log

tools/merge/f1/CURRENT

tools/merge/f1/IDENTITY

tools/merge/f1/LOCK

tools/merge/f1/LOG

tools/merge/f1/LOG.old.1456897359065647

tools/merge/f1/LOG.old.1456897518380429

tools/merge/f1/LOG.old.1456897643867179

tools/merge/f1/LOG.old.1456897758651559

tools/merge/f1/LOG.old.1456897793721910

tools/merge/f1/LOG.old.1456897989507112

tools/merge/f1/LOG.old.1456899695614114

tools/merge/f1/LOG.old.1456899746827115

tools/merge/f1/LOG.old.1456899803268796

tools/merge/f1/MANIFEST-000029

tools/merge/f2/000027.log

tools/merge/f2/CURRENT

tools/merge/f2/IDENTITY

tools/merge/f2/LOCK

tools/merge/f2/LOG