getting stuck in root dir

[BigMacTaylor]

At risk of sounding redundant, while 64107f9 keeps nim from raising OSErrors it ignores the root problem.
Which is that calling parentDir() on root returns a empty string. NOT "/". Therefore if parent != currentDir: returns true.

A fix would be:
if parent != currentDir and parent != "":
or even better:
if not isRootDir(currentDir):

      else:
        let parent = parentDir(currentDir) # returns empty string
        if parent != currentDir: # returns true
          currentDir = parent
          scanDir(currentDir)
          applyFilter()

Hope this didn't come off harsh. I like project and wish it well.