[phobos] std.path proof of concept

[Lars Tandle Kyllingstad]

I am convinced that what I've proposed is a good idea, so I made a tiny 
proof-of-concept version of the module.

In fact, I found an even better way to do it:  Instead of putting the 
functions inside structs, I just have one template of which the 
appropriate instantiation is mixed into the module scope.  So, on Windows,

     getDirectory("c:\\foo\\bar.txt")         -->  "c:\\foo"
     Path!Posix.getDirectory("/foo/bar.txt")  -->  "/foo"

In this way, there is no code duplication and no more work for the 
library maintainer, only more flexibility for the user.  Check out the 
code and documentation if you don't believe me:

   http://github.com/kyllingstad/ltk/blob/master/ltk/path.d
   http://kyllingen.net/code/ltk/doc/path.html


-Lars