Deal with cases where the stats aren't available
Merge pull request #94 from eric/deal-with-empty-kestrel-stats

Deal with cases where the stats aren't available
Remove internal plugin alerting.

This caused alerts being sent every time scout ran if cluster was unhealthy. That's not
what we want.
Merge pull request #95 from johnae/master

Ceph plugin: remove internal alerting
add thread requirement to delayed job plugin
add pry to gems
support old and new indices format
remove string response from url_monitor, replaced with numeric code
update yaml file to report url monitoring status appropriately
add retry to ntp_time in case ntp server times out
Merge pull request #97 from scoutapp/remove_string_values

Remove string values
updating units
add ruby-version to gitignore
Merge branch 'master' of github.com:scoutapp/scout-plugins