Remove logging of directory entry in verbose mode

Fixes #4

The logging of directory entry is of little value, so we remove it.
Skip scanning of long paths

Fixes #5

The .Net APIs does not handle filenames longer than 260 chars. There are
ways to get around this, see for example
http://blogs.msdn.com/b/bclteam/archive/2007/02/13/long-paths-in-net-part-1-of-3-kim-hamilton.aspx

But this is not a priority, the current version seems to work in most
cases.