Initial support for alert priorities

Allow's you to set alert priorities for use with pagerduty notifications.

0 - ignore alert - don't generate a pagerduty alert
1 - notify using service key 1
2 - notify using service key 2
Merge branch 'dev' of github.com:pandemicsyn/stalker into dev
bump version
Merge pull request #26 from pandemicsyn/dev

Dev