fork of https://github.com/rust-rocksdb/rust-rocksdb for nextgraph

Niko PLP 081ffa92ee Squashed 'librocksdb-sys/rocksdb/' content from commit 217f76421 ... git-subtree-dir: librocksdb-sys/rocksdb git-subtree-split: 217f7642119aa60a9fa64bc64e02d7f78813d911		2 years ago
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range_tree	Squashed 'librocksdb-sys/rocksdb/' content from commit 217f76421	2 years ago
range_lock_manager.h	Squashed 'librocksdb-sys/rocksdb/' content from commit 217f76421	2 years ago
range_locking_test.cc	Squashed 'librocksdb-sys/rocksdb/' content from commit 217f76421	2 years ago