Add context: parameter about reqwest

[ded]

i think you'd be better off currying the function yourself rather than it being built-in. what's your general use-case?

[gka]

maybe it's just that i got used to this api over the years, but currying myself is fine, too.

my general use case is that I often need to load several files at once. currently i'm writing a tiny ender extension for this functionality. because of the missing context option, I now had to include the Function.prototype.bind thing to ensure that the success handler is always bound to the right context.

but i'm sure there must be an easier way to do the same..