Directories starting with n incorrectly escaped on Windows

Since the path separator on Windows is '\' directories starting with n are incorrectly escaped since the backslash and the following n is interpreted as a linebreak. I expanded the regular expression when escaping text a little bit so it now omits these cases.

I have tested it on Windows 8 (I added some tests showing the issue).

You can ignore the flavored_path module I committed initially, it did not help with this issue (I thought it used forward slashes when resolving paths on Windows which it does not).