Update dependencies to use sirupsen not Sirupsen

That entailed a few other fixes, eg small Notary API changes.

Signed-off-by: Justin Cormack <justin.cormack@docker.com>

.circleci/config.yml

@@ -0,0 +1,37 @@
+version: 2
+jobs:
+  build:
+    machine:
+      image: circleci/classic:201710-02
+    environment:
+      GOPATH: /home/circleci/.go_workspace
+    working_directory: $GOPATH/src/github.com/moby/tool
+    steps:
+      - checkout
+      - run:
+          name: "Lint"
+          command: |
+            go version
+            GOMETALINTER_SHA=cc4415ed09f7073d595ee504cad4d98b71a3038e
+            go get -d github.com/alecthomas/gometalinter
+            cd $GOPATH/src/github.com/alecthomas/gometalinter
+            git checkout -q "$GOMETALINTER_SHA"
+            go build -v -o $GOPATH/bin/gometalinter .
+            export PATH=$GOPATH/bin:$PATH
+            gometalinter --install
+            cd $GOPATH/src/github.com/moby/tool
+            make lint
+      - run:
+          name: "Test"
+          command: |
+            cd $GOPATH/src/github.com/moby/tool
+            make test
+      - run:
+          name: "Build"
+          command: |
+            cd $GOPATH/src/github.com/moby/tool
+            make GOOS=darwin  dist/moby-darwin
+            make GOOS=windows dist/moby-windows
+            make GOOS=linux   dist/moby-linux
+      - store_artifacts:
+          path: ./dist