v1.0.0: Merge pull request #17 from eko/replace-mockery-with-gomock

New Features

140d01b Using promauto to initialize the metric and testutil in tests
7847237 feat: added Clear() method to flush all cache data
16d5e61 docs: added some store benchmarks

Fixes

3b46630 fix(tests): replace mockery by gomock and fix race conditions
19c7bf8 test: rework unit tests to isolate mocks and add missing cases
0627751 style: fixed mispelling words and missing comments

Other

2c2e7d2 build(deps): bump github.com/coreos/etcd
871607c build(deps): bump github.com/prometheus/client_golang
f9ee181 docs: updated README.md with custom cache/store interfaces
256357e doc: added codecov badge
9de424d ci: added codecov to .travis.yml