Don't use deprecated v8::Template::Set(). (#560)
Don't use deprecated v8::Template::Set(). (#560)

See [0] and [1]: starting with node.js v6, setting non-primitive values
on FunctionTemplate and ObjectTemplate instances is discouraged; v7 will
downright disallow it.  Update `Nan::SetPrototypeMethod()`.

[0] https://github.com/nodejs/node/issues/6216
[1] https://github.com/nodejs/node/pull/6228
nodejs/nan,nodejs/nan,eljefedelrodeodeljefe/nan,nodejs/nan,gagern/nan,eljefedelrodeodeljefe/nan,gagern/nan,gagern/nan,eljefedelrodeodeljefe/nan,nodejs/nan,eljefedelrodeodeljefe/nan