Replaced backslashes with forwardslashes in path

LaTeXSQ produced paths which contained backslashes. This made the paths invalid since backslash is an escape character in latex.
Replace the OS specific path separator with forward slash

This fixes the problem with backslashes on windows while not replacing them on unix.
Merge pull request #12 from samolesen/patch-1

Replaced backslashes with forwardslashes in path