refactor: log with zap

vendor/go.uber.org/zap/glide.yaml

@@ -0,0 +1,34 @@
+package: go.uber.org/zap
+license: MIT
+import:
+- package: go.uber.org/atomic
+  version: ^1
+- package: go.uber.org/multierr
+  version: ^1
+testImport:
+- package: github.com/satori/go.uuid
+- package: github.com/sirupsen/logrus
+- package: github.com/apex/log
+  subpackages:
+  - handlers/json
+- package: github.com/go-kit/kit
+  subpackages:
+  - log
+- package: github.com/stretchr/testify
+  subpackages:
+  - assert
+  - require
+- package: gopkg.in/inconshreveable/log15.v2
+- package: github.com/mattn/goveralls
+- package: github.com/pborman/uuid
+- package: github.com/pkg/errors
+- package: github.com/rs/zerolog
+- package: golang.org/x/tools
+  subpackages:
+  - cover
+- package: golang.org/x/lint
+  subpackages:
+  - golint
+- package: github.com/axw/gocov
+  subpackages:
+  - gocov