Frontend: add in select2 and select2-foundation

[dpslwk]

Hope I got the correct way of importing plain css into the css correct, seems to compile at least

Theme thanks to https://github.com/zflat/select2-foundation

Apply the theme

Configure select2 To apply the theme by passing foundation to the theme option when initializing:

$( "#dropdown" ).select2({
    theme: "foundation"
});