[libposix-development] Initial printf implementation

[Henrique A. <hd...@gm...>]

 I've uploaded an initial printf implementation that can format the
following arguments:

 - all variations of integer formats, except for arguments that use
both zero-padding and thousand grouping separators (it's easy to
implement, but it'll be useful only when we start dealing with
locales)
 - "%s"

 Later, I'll add tests for integer formats and finish dealing with
string arguments. If you're interested in testing, please write your
own tests too.

-- 
 Henrique Dante de Almeida
 hd...@gm...