Converted `admin.sass` to `admin.scss`.
Converted `jquery.sass` to `jquery.scss`.
Converted `_profiles.sass` to `_profiles.scss`.
Converted Wiki CSS from `sass` to `scss`.
Converted Ticket filters CSS from `sass` to `scss`.
Converted Timeline CSS from `sass` to `scss`.
Converted SexyTooltips CSS from `sass` to `scss`.
Converted Popover CSS from `sass` to `scss`.
Converted textarea editor CSS from `sass` to `scss`.
Split most of the CSS from `default.sass` into separate files.