[ANN] Scanf 0.3

Scanf is the C-style of io-stream formatted reading.
This version provides most features of standard scanf C function family.

example usage:

julia> using Scanf

julia> r, a, b, c, d = @scanf "42 -infABCDE hello" "%d%f%5c%s" 0 0f0 String ""
(4, 42, -Inf32, "ABCDE", "hello")

Discussions and improvement requests are welcome.

  1. Documentation should copy relevant part of the C++ standard description?
  2. argument specifications with Ref wrappers maybe not useful, remove?