Kerning support

[Alexandre Leray <alexandre stdin fr>]

Hi,

I started to use Epiphany pretty recently and noticed strange metrics
with my fonts: the letterspaces seems pretty heterogeneous — not very
harmonious.

I was wondering before investigating further if Epiphany actually had
support for kerning.

I'm using Epiphany 3.16.3 with WebkitGTK 2.8.5 and Fontconfig-Infinality
Ultimate on Arch Linux.

Thanks,

Alex