Checkbox select bg images

Removes use of o-ft-icons code point in checkboxes and data uri in selects.

Open issues:
* Tint doesn't seem to work for icons in the image service
* Image service sometimes returns a 403
* Products can't serve their own image resources
Oh, I don't think we need that anymore anyway
On 16 Oct 2014 10:00, "Alberto Elias" <notifications@github.com> wrote:

> In src/scss/_functions.scss:
>
> > @@ -0,0 +1,3 @@
> > +@function _stripUnits($n) {
> > +    @return $n / ($n * 0 + 1);
>
> Why not just divide by 1? Won't $n*0 always be 0?
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/Financial-Times/o-ft-forms/pull/54/files#r18944383>.
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