vendor: vendor all dependencies

Since #1 there is at least some subset of dependencies that will not
work with all clients; since this is a binary, it's not difficult to
vendor the correct set of dependencies, so do so.

Gopkg.toml

@@ -0,0 +1,46 @@
+# Gopkg.toml example
+#
+# Refer to https://golang.github.io/dep/docs/Gopkg.toml.html
+# 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
+
+
+[[constraint]]
+  name = "github.com/dustin/go-humanize"
+  version = "1.0.0"
+
+[[constraint]]
+  name = "github.com/kevinburke/rest"
+  version = "2.2.0"
+
+[[constraint]]
+  name = "github.com/tomnomnom/linkheader"
+  version = "0.1.0"
+
+[[constraint]]
+  name = "github.com/voxelbrain/goptions"
+  version = "2.5.11"
+
+[prune]
+  go-tests = true
+  unused-packages = true