Allow ScribbleDecoder to set severity from the message template.
Don't accept non-integer severity values.
Merge pull request #1089 from mozilla-services/message-template-severity

Allow ScribbleDecoder to set severity from the message template.
Prevent orphaned matchers from being registered with the router in
cases where multiple TOML files specify filter and/or output plugin with
the same name. Also output pack diagnostic idle time in seconds
rather than nanoseconds.
Use API instead of doing the math.
Merge pull request #1098 from mozilla-services/orphaned-matchers-bug

Orphaned matchers bug
Add 0.7.2 release date to changelog.
Merge branch 'versions/0.7' into dev

Conflicts:
	CHANGES.txt