[FOLD] Fix RocksDB backend
[FOLD] ripple_rocksdb compile fixes
[FOLD] nodestore changes
Merge branch 'feature-rocksdb' of github.com:vinniefalco/rippled into feature-rocksdb

Conflicts:
	src/ripple/rocksdb/ripple_rocksdb.cpp
Merge branch 'feature-rocksdb' of github.com:vinniefalco/rippled into feature-rocksdb