Update alarms every 5 sec
Add sound files for ping
Show alert on server error

Show an alert whan server comunication fails. When comunication
reestablished, show success alert confirming connection.
Trying to add sound
Use soundjs for playing sound
Play sound when new list is longer than old list

Pretty naive implementation….
Fix if condition
Merge pull request #57 from iver56/alarms-update

Alarms update