Added sessions_until_state metric
Added tests for sessions_until_state metric
Merge branch 'feature/issue-4-state-total-metric' into feature/issue-5-sessions-until-state-metric
Moved validating actions and creating metric labels into their own function
Fixed automatic metric label
Added helpful comments
Removed saves as they happen automatically when the sandbox terminates
Merge branch 'feature/issue-5-sessions-until-state-metric' into develop