Filenames slugifications (#28, #31, #9, #8)
Add number padding and lowering for file names (not directory)
Merge from master
Convert dot char to hyphen.
Removes UNIX-hidden files and dirs from the final archive (prevents .DS_Store and stuff)
Remove Windows silly 'thumbs.db' too
Small fixes
Merge pull request #46 from ciromattia/slugify

Filenames slugification