cmd/geth: fix #853 colorize console output in windows

Godeps/Godeps.json

...ps/_workspace/src/github.com/mattn/go-colorable/README.md

...ace/src/github.com/mattn/go-colorable/colorable_others.go

...ce/src/github.com/mattn/go-colorable/colorable_windows.go

Godeps/_workspace/src/github.com/mattn/go-isatty/README.md

Godeps/_workspace/src/github.com/mattn/go-isatty/doc.go

...s/_workspace/src/github.com/mattn/go-isatty/isatty_bsd.go

..._workspace/src/github.com/mattn/go-isatty/isatty_linux.go

...orkspace/src/github.com/mattn/go-isatty/isatty_windows.go

cmd/geth/main.go