Allow file sharing with iTunes

Enabling file sharing with iTunes we'll allow people to load files in the /Documents folder of the Mobile app.

Enabling file sharing is easy, we just need to add this in the Phonegap build config.xml:

<gap:config-file platform="ios" parent="UIFileSharingEnabled" mode="replace">
<true/>
</gap:config-file>

But, we'll have to move or show this files in the Shared files option. (Show is the best choice here because they belong to any site)