Bug: multiline object literal requires braces in post-loops

Choose one: is this a bug report or feature request?

A bit of both.

### Input Code

[#try](http://coffeescript.org/#try:use%20k%2C%20v%20for%20k%2C%20v%20of%0A%20%20k%3A%20v%0A)
```coffee
use k, v for k, v of
k: v
```
While this also applies to
```coffee
use k, v for x in # or `from`
k: v

# and

use k, v while # or `until`
k: v
```
i don't see any point in supporting that.

### Expected Behavior
```js
# (shortened)
for (k in {k: v}) {
use(k, v);
}
```
### Current Behavior
```js
[stdin]:2:1: error: unexpected indentation
k: v
^^
```

### Workaround
```coffee
use k, v for k, v of \
k: v \
a: b \
x: y

# or

use k, v for k, v of {
k: v
a: b
x: y
}
```
### Possible Solution

Add implicit line continuation support for objects in *eof* for-of loop *headers*.
The logic used in function calls might be reusable.

### Context

Ran into this a couple of times expecting the compiler to accept it.

### Environment

* CoffeeScript version: v2.5.1
* Node.js version: any



Btw, do you call this an implicit object? What's the term generally used for omitting object braces?

Start by reproducing the multiline object examples in the issue with the CoffeeScript compiler and compare the current error with the expected JavaScript. Read the parser logic for end-of-file `for`, `of`, `in`, `while`, and `until` loop headers, especially the implicit line-continuation logic used in function calls. Done means the examples compile without explicit braces or continuation escapes.

Written by the indexing model from the issue text.