Range Construction Pattern

[Tobias Pankrath]

> Great!
>
> See also: 
> https://stackoverflow.com/questions/21954381/range-construction-pattern/21954416?noredirect=1#21954416

I don't think that 'create' is a good name for a function, that 
basically lazily evaluates another function foo n times. Maybe 
std.range.repeat should have an overload that takes an alias to a 
callable, so you don't need this rather awkward use of iota.