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Recent version of dep - 0.5.0 produces errors on `dep status`:
```
◦ dep status
Gopkg.lock is out of sync with imports and/or Gopkg.toml. Run `dep check` for details.
PROJECT  MISSING PACKAGES
input-digest mismatch
```

This commit updates `Gopkg.lock` to recent dep format

I essentially ran `dep ensure`.

Add CoveredNetworks option

This would cause error when checking out with git clone --recursive,
such as when golang dep clones the repo.
Signed-off-by: Rob Adams <readams@readams.net>

Signed-off-by: Rob Adams <readams@readams.net>

* Search by CIDR rather than just by IP.
Signed-off-by: Rob Adams <readams@readams.net>

travis: add 1.9.x to go versions

Fix index-out-of-bound bug when inserting network that shares direct branch point with single-IP (leaf) network, closes #3

Support storing custom user data with inserted entries to Ranger by introducing the RangerEntry interface, closes #2

Implement uint32 array reprentation for ip address of both IPv4 and IPv6 to enable fast bit level calculation

Add benchmarks for ip utility functions and separate benchmark for hit/miss cases for Ranger implementations