Feature/#32 more sharing

Indeed, v1.3 and v2.0 of FxOS don't return the same infos from
```
document.forms["share-form"].elements["radio-share"]
```
on v2.0, we've got: 2 node elements and a value parameter reprensenting the selected element.
and on v1.3: just 2 node elements.
Thanks for noticing it.