added podle.audio

[andreasbovens]

resolves #113

[pepelsbey]

There’s no need for such complicated way of inserting icon via ::before, I did it for Paper Planes only because of box-shadow. It’s much easier to use multiple backgrounds for that, just like we already did in most of the cases:

    background:
        url(../images/pokedex.png) 50% 50% / 50% auto no-repeat,
        linear-gradient(to right, #78C850 50%, #A040A0 50%)
        #78C850;