Refactor: options should be set on the internal options object

[jonathanong]

so that they persist across requests

[felixfbecker]

What do you mean by that? Instead of returning a new request client when request.defaults() is called?

[jonathanong]

@felixfbecker i don't remember... probably

[felixfbecker]

xD

[jonathanong]

ok i think this is for two reasons:

• easy to set defaults to extend from it
• easy to retry a request (needed for retry support)