[Proposal] Option to generate stream from `for`

[luk...@niemier.pl]

Currently, while there is `:into` option in `for`, there is no way to make it into "regular" stream. It would be handy to have a way to either make something like:

```

for a <- 1..10, b <- 1..10, into: Stream, do: {a, b}

```

Or have additional option:

```

for a <- 1..10, b <- 1..10, stream: true, do: {a, b}

```

That would make `for` to return stream. This can be handy in cases where resulted list would be so huge, that it would start to be problematic for VM to catch up.

[José Valim]

"into: Stream" plays well with the current semantics where "into: ..." changes the return value however, because emitting a stream would require "for" to emit a completely different code than today, "into: Stream" would only work if the Stream module is given at compilation time. In a nutshell, this is welcome, but it is a relatively high amount of work.

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