When you are playing with Git, you may encounter this situation. Which is, more than painful from my point of view:
> git add wordpress-4.4/wp-content/plugins/crayon-syntax-highlighter fatal: CRLF would be replaced by LF in wordpress-4.4/wp-content/plugins/crayon-syntax-highlighter/crayon_fonts.class.php.
This mean you have an issue with the Operating System EOL (end of line) file format.