Update finagle version to 7.0.0 (#359)

Replaced Ketama client with Memcache client

Bumped finagle version to 7.0.0
`client.release()` method was deprecated and in latest version of finagle release method was removed. 7.0 is the earliest version with close method available.

Also `KetamaClientBuilder` was removed from 7.0 hence replacing it with `Memcached.client`. Destination path for both KetamaClient and Memcached client is same, hence the same `nodeString` works.

Bump finagle version to 7.0.0

Bump finagle version to 7.0.0

Release 0.15.0

Release 0.15.0

Update version in preparation for release. Note that release notes wi…

…ll be part of the release on github.

Releasing 0.15.0-RC1

Releasing 0.14.0-RC1

Releasing 0.13.0

the 0.12.0 release

storehaus 0.11.2