Relative path in sync ignored files/paths

[gullitmiranda]

When azk reads a path from .syncignore or .gitignore, it cannot handle relative paths.

This decision would be a little tricky, because the user can be really wishing to ignore an file from root.

I believe that only for the .gitignore case, a . should be added before every starting /, making the path relative. After all, .gitignore consider all paths relative from its own location.