Add `dep` vendoring

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 = "github.com/aclindsa/xml"
+  packages = ["."]
+  revision = "5d4402bb4a207d3f39d33ae127c97557e1df8f05"
+
+[[projects]]
+  branch = "master"
+  name = "github.com/howeyc/gopass"
+  packages = ["."]
+  revision = "bf9dde6d0d2c004a008c27aaee91170c786f6db8"
+
+[[projects]]
+  branch = "master"
+  name = "golang.org/x/crypto"
+  packages = ["ssh/terminal"]
+  revision = "9f005a07e0d31d45e6656d241bb5c0f2efd4bc94"
+
+[[projects]]
+  branch = "master"
+  name = "golang.org/x/sys"
+  packages = ["unix","windows"]
+  revision = "0dd5e194bbf5eb84a39666eb4c98a4d007e4203a"
+
+[[projects]]
+  branch = "master"
+  name = "golang.org/x/text"
+  packages = ["currency","internal","internal/format","internal/gen","internal/tag","language","unicode/cldr"]
+  revision = "88f656faf3f37f690df1a32515b479415e1a6769"
+
+[solve-meta]
+  analyzer-name = "dep"
+  analyzer-version = 1
+  inputs-digest = "f525aa3486677af689ea4b5345ce14e3c9569d7187e19a56c9bdb5bf1480a866"
+  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 = "github.com/aclindsa/xml"
+
+[[constraint]]
+  branch = "master"
+  name = "github.com/howeyc/gopass"
+
+[[constraint]]
+  branch = "master"
+  name = "golang.org/x/text"