exclude-dir doesn't work with multi-level dir

[scottc-WellSky]

Describe the bug
exclude-dir does not work with multiple-level paths, such as: scc --exclude-dir level1\level2

To Reproduce

1. Tell us how you were using scc either as command line or library.
   command line

2. If command line please list the arguments. If library please supply code to demonstrate the issue.
   scc --exclude-dir level1\level2
   (also tried scc --exclude-dir level1/level2 - back slash vs forward slash)

3. If the issue is a miscount or some such please link or supply a file which demonstrates the issue.

Expected behavior
Given a structure such as:
\MyRepo
..program.cs
....\level1
......\level2
........MyReport.rdl

"scc --exclude-dir level1\level2" should not include MyReport.rdl (i.e. \MyRepo\level1\level2\MyReport.rdl).

Desktop (please complete the following information):

• Windows
• 3.4.0

** Additional questions for completeness

• Can / or \ be used as the path separator? ..or is it dependent on OS?
• Can I include quotes around the exclude-dir value when there are spaces in the paths, such as:
  "scc --exclude-dir "level1\level2,level1\Stored Procs"?