IITC Mobile buildable again

Hi !
I've seen the version of IITC Mobile apk on your site is not the last one, so I made it buildable.
As I don't have the original keyring I can not send you a proper apk with the changes but now it can build with the latest version of IITC.

(next steps : upgrade the JS from the site directly from the application, and then enable plugins)