Godeps: add github.com/spf13/cobra to vendored packages

Godeps/Godeps.json

...orkspace/src/github.com/inconshreveable/mousetrap/LICENSE

...kspace/src/github.com/inconshreveable/mousetrap/README.md

...e/src/github.com/inconshreveable/mousetrap/trap_others.go

.../src/github.com/inconshreveable/mousetrap/trap_windows.go

.../github.com/inconshreveable/mousetrap/trap_windows_1.4.go

Godeps/_workspace/src/github.com/spf13/cobra/.gitignore

Godeps/_workspace/src/github.com/spf13/cobra/.mailmap

Godeps/_workspace/src/github.com/spf13/cobra/.travis.yml

Godeps/_workspace/src/github.com/spf13/cobra/LICENSE.txt

Godeps/_workspace/src/github.com/spf13/cobra/README.md

..._workspace/src/github.com/spf13/cobra/bash_completions.go

..._workspace/src/github.com/spf13/cobra/bash_completions.md

Godeps/_workspace/src/github.com/spf13/cobra/cobra.go

...ps/_workspace/src/github.com/spf13/cobra/cobra/cmd/add.go

...workspace/src/github.com/spf13/cobra/cobra/cmd/helpers.go

...s/_workspace/src/github.com/spf13/cobra/cobra/cmd/init.go

...orkspace/src/github.com/spf13/cobra/cobra/cmd/licenses.go

...s/_workspace/src/github.com/spf13/cobra/cobra/cmd/root.go

Godeps/_workspace/src/github.com/spf13/cobra/cobra/main.go