Issue #32 : Updated concatenation of filepath and filename to prevent do...

Issue #32 : Updated concatenation of filepath and filename to prevent double backslash

Well, I think I found how to do pull requests. The code changes work for me on Windows, and files are really removed from the index. I am currently not able to test on Linux.

I added a TODO in the adding new files to the index because in some cases this does not work. When I copy a file, the created date is updated but not the last modified data. Then the file is not added to the index.