truncate long SMS messages
use Event.add in scripts rather than direct lpush
non-zero return code when interrupted
Merge pull request #286 from ali-graham/278_shorten_sms_messages

Shorten SMS messages
Merge pull request #287 from ali-graham/275_event_add_in_scripts

Event#add in scripts
default exit value for coordinator stop
tweak exit code in flapjack script
Merge pull request #288 from ali-graham/266_return_code_on_interrupt

Return code on interrupt