Lock and manifest changed from json to toml

[elfgoh]

• go version go1.8.1 linux/arm
• error during make install
• This seems to be the cause as dep now uses TOML

panic: interface conversion: interface {} is *toml.TomlTree, not []*toml.TomlTree

goroutine 1 [running]:
github.com/golang/dep/vendor/github.com/pelletier/go-toml.valueFromToml(0x1664200, 0x13e52a0, 0x1469700, 0xc420133900, 0xc420133900, 0x13e52a0, 0x13d03dd, 0x1d, 0x0)
	/Users/plgl757e/Projects/go/src/github.com/golang/dep/vendor/github.com/pelletier/go-toml/marshal.go:327 +0x223
github.com/golang/dep/vendor/github.com/pelletier/go-toml.valueFromTree(0x1664200, 0x1448480, 0xc4201338a0, 0x0, 0x0, 0x90, 0x0, 0x1657ea0)
	/Users/plgl757e/Projects/go/src/github.com/golang/dep/vendor/github.com/pelletier/go-toml/marshal.go:270 +0x2c6
github.com/golang/dep/vendor/github.com/pelletier/go-toml.Unmarshal(0xc420178000, 0x90, 0x600, 0x13d8760, 0xc42001b3e0, 0x0, 0xc42011b830)
	/Users/plgl757e/Projects/go/src/github.com/golang/dep/vendor/github.com/pelletier/go-toml/marshal.go:245 +0x1d6
github.com/golang/dep.readManifest(0x1658ca0, 0xc42000e140, 0xc42000e140, 0x0, 0x0)
	/Users/plgl757e/Projects/go/src/github.com/golang/dep/manifest.go:49 +0x16b
github.com/golang/dep.(*Ctx).LoadProject(0xc420130e70, 0x0, 0x0, 0x0, 0x0, 0x0)
	/Users/plgl757e/Projects/go/src/github.com/golang/dep/context.go:113 +0x415
main.(*ensureCommand).Run(0xc420133720, 0xc420130e70, 0xc42000c2e0, 0x0, 0x0, 0x0, 0x0)
	/Users/plgl757e/Projects/go/src/github.com/golang/dep/cmd/dep/ensure.go:110 +0x80
main.main()
	/Users/plgl757e/Projects/go/src/github.com/golang/dep/cmd/dep/main.go:125 +0x6df
make: *** [dep] Error 2