Make whole application offline-capable.

Especially given that there is absolutely no need for the application to
use network, and that it could be quite useful in sitautions where
a mobile device (e.g., my Firefox OS phone) is not connected, offline availability could be quite useful.

Author of the application should consider whether all listed resources are actually required for use of the application.

Signed-off-by: Matěj Cepl <mcepl@redhat.com>