Switch to dep for dependency management

I find it to be a bit faster in some cases, and easier to work with.

Gopkg.toml

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+# Gopkg.toml example
+#
+# Refer to https://github.com/golang/dep/blob/master/docs/Gopkg.toml.md
+# for detailed Gopkg.toml documentation.
+#
+# required = ["github.com/user/thing/cmd/thing"]
+# ignored = ["github.com/user/project/pkgX", "bitbucket.org/user/project/pkgA/pkgY"]
+#
+# [[constraint]]
+#   name = "github.com/user/project"
+#   version = "1.0.0"
+#
+# [[constraint]]
+#   name = "github.com/user/project2"
+#   branch = "dev"
+#   source = "github.com/myfork/project2"
+#
+# [[override]]
+#   name = "github.com/x/y"
+#   version = "2.4.0"
+#
+# [prune]
+#   non-go = false
+#   go-tests = true
+#   unused-packages = true
+
+
+# Utility library deps
+[[constraint]]
+  branch = "master"
+  name = "github.com/golang/glog"
+
+[[constraint]]
+  name = "github.com/prometheus/client_golang"
+  version = "0.8.0"
+
+[[constraint]]
+  branch = "master"
+  name = "github.com/prometheus/common"
+
+[[constraint]]
+  name = "github.com/spf13/cobra"
+  version = "0.0.3"
+
+[[constraint]]
+  name = "gopkg.in/yaml.v2"
+  version = "2.2.1"
+
+# Kubernetes incubator deps
+[[constraint]]
+  # hard lock on a commit until we have releases
+  revision = "fae01650d93f5de6151a024e36323344e14427aa"
+  name = "github.com/kubernetes-incubator/custom-metrics-apiserver"
+
+# Core Kubernetes deps
+[[constraint]]
+  name = "k8s.io/api"
+  version = "kubernetes-1.9.0"
+
+[[constraint]]
+  name = "k8s.io/apimachinery"
+  version = "kubernetes-1.9.0"
+
+[[constraint]]
+  name = "k8s.io/apiserver"
+  version = "kubernetes-1.9.0"
+
+[[constraint]]
+  name = "k8s.io/client-go"
+  version = "kubernetes-1.9.0"
+
+[[constraint]]
+  name = "k8s.io/metrics"
+  version = "kubernetes-1.9.0"
+
+# Test deps
+[[constraint]]
+  name = "github.com/stretchr/testify"
+  version = "1.2.2"
+
+[prune]
+  go-tests = true
+  unused-packages = true