Ask for passphrase when importing keys during registration (UNTESTED)

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>
Warn user when something goes wrong during key import

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>
Hold/release message center on resume/pause

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>
Merge branch 'master' into composite_balloon