Remove gulp dependency

[vitorgomateus]

This issue was raised in this discussion #761.

Issue

loop and lib do not have the same method to compress SCSS files.

Possible solution

This can be done by adding {% compress css %} to base\templates\base\intranet_base.html.
This might break the CSS slightly at first, as some recent changes were made to the output CSS directly.
Note:
With the current compress settings, CSS files cannot be included within the tag.

Extra

It would be nice to have gulp or an alternative method to compress SCSS during development.