Feature request: zip analog with failed promises

[numen31337]

I think this will be helpful to have some function analog to the 'zip' function which will accept the list of promises, wait until all of them is finished and returns both failed and resolved in the result.

[r-plus]

In that case I think you should wrap the resolved value and error to one object (e.g. Result).

[numen31337]

Yes, that's clear, but in this case, it forces me to use some other way of error handling in addition to this library.