use dep to manage vendor directory

Gopkg.lock

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+# This file is autogenerated, do not edit; changes may be undone by the next 'dep ensure'.
+
+
+[[projects]]
+  branch = "master"
+  name = "code.ivysaur.me/imagequant"
+  packages = ["."]
+  revision = "6a468707fb1bb44c4bb71113273cc73daf401976"
+
+[[projects]]
+  branch = "master"
+  name = "github.com/hashicorp/golang-lru"
+  packages = [".","simplelru"]
+  revision = "0fb14efe8c47ae851c0034ed7a448854d3d34cf3"
+
+[[projects]]
+  branch = "master"
+  name = "golang.org/x/image"
+  packages = ["bmp","draw","math/f64","riff","vp8","vp8l","webp"]
+  revision = "af66defab954cb421ca110193eed9477c8541e2a"
+
+[solve-meta]
+  analyzer-name = "dep"
+  analyzer-version = 1
+  inputs-digest = "bbec1c5a83e20c224400fbd1c97a4c81d91429b7a6b22f05a579788b101a7e72"
+  solver-name = "gps-cdcl"
+  solver-version = 1

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"
+
+
+[[constraint]]
+  branch = "master"
+  name = "code.ivysaur.me/imagequant"
+
+[[constraint]]
+  branch = "master"
+  name = "github.com/hashicorp/golang-lru"
+
+[[constraint]]
+  branch = "master"
+  name = "golang.org/x/image"