Set a default value for label
Changed from camel case to underscores
Merge branch 'feature/issue-2-new-user-metric' into feature/issue-3-total-sessions-metric

Conflicts:
	test/test_metrics_helper.js
Removed state text test
Merge branch 'feature/issue-2-new-user-metric' into feature/issue-3-total-sessions-metric
Merge branch 'feature/issue-2-new-user-metric' into develop
Merge branch 'develop' into feature/issue-3-total-sessions-metric
Added default new session metric label