Add `newline` at the end of the gitattributes file

Under UNIX-like OSes, a text file consists of a series of lines, each
of which ends with a `newline` character (`\n`). A file that is not
empty and does not end with a `newline` is therefore considered not to
be a text file.

Because of this, utilities that are supposed to operate on text files
may not cope well with files that don't end with a `newline` (e.g.: they
might ignore the text after the last `newline`).

Adding the `newline` character at the end of the file ensures that users
won't encounter any odd behavior when using it.

Reference/Source: http://unix.stackexchange.com/a/18789.
Update print related comments in `main.css` file

Use correct terminology and remove the outdated parts of the comments.

See also:

 * JavaScript URIs:
   https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/void#JavaScript_URIs

 * URL fragments:
   http://www.whatwg.org/specs/web-apps/current-work/multipage/history.html#scroll-to-fragid

 * `href` attribute:
   http://www.whatwg.org/specs/web-apps/current-work/multipage/semantics.html#attr-link-href
   https://developer.mozilla.org/en-US/docs/Web/HTML/Element/a#attr-href