capture pikelet exceptions at top level, clean shutdown
Merge pull request #163 from ali-graham/143_handle_executive_exceptions

capture pikelet exceptions at top level, clean shutdown
speed up most web UI screens significantly
add gh-143 to changelog
merge changelog
Merge pull request #165 from jessereynolds/164_web_ui_slow

164 web ui slow
Merge branch 'master' of github.com:flpjck/flapjack into 146_validate_notification_rules