Fix absolute paths

[smcgivern]

This should fix #191 and maybe #196 too.

The relativeTo option was removed at https://github.com/gruntjs/grunt-contrib-cssmin/pull/170/files#diff-f0ee9eb300066e1e51fcfbad9d7a78e1L45 and seemingly never added back.

[XhmikosR]

/CC @sindresorhus

[sindresorhus]

Should use path.join().

[smcgivern]

Good points. Do you mind if I just amend the existing commit, or would you prefer a separate one?

[XhmikosR]

@smcgivern: just amend.

[smcgivern]

OK, done 👍

[jd-carroll]

I know this is already merged, but..

Why are you setting:

options.relativeTo = path.dirname(availableFiles[0]);

When it should be relative to the destination:

options.relativeTo = options.target = file.dest;

[smcgivern]

Honestly, because it was like that before:

grunt-contrib-cssmin/tasks/cssmin.js

Line 45 in 4af3941

options.relativeTo = path.dirname(file);

In the case here, where we're using absolute paths, it doesn't look like it matters. A test case that shows why this is the wrong behaviour is probably the best thing to provide.

This also isn't merged - @XhmikosR a little help please? 😃