Argument of include can't have linebreak

Now this is serious trouble for me.

What i mean is that:

```
@@include('templates/main_heading.tpl.html', {
"subheader": "Subheader introduction",
})
```

pass ok

```
@@include('templates/main_heading.tpl.html', {
"subheader": "
Subheader introduction
test test test
",
})
```

is not!
got:
Warning: Unexpected token
Use --force to continue.

This is superimportant, since you can do stuff like that even:

```
@@include('templates/main_heading.tpl.html', {
"content": "

thiis is my supadupa haeding

And everything passes perfectly good except linebreaks :\

I really hope it's fixeable (seem to be regex issue that can be overcome)
If anybody can post solution immideately (before | if at all) it would be fixed with new release i would love to see it)