Populating the endpoint and showing the help text as the value of the drop-down changes.
Merge branch 'feature/940-genericize-addr-settings-ui' of https://github.com/SalesforceFoundation/Cumulus into feature/940-genericize-addr-settings-ui
Merge branch 'feature/940-genericize-addr-settings-ui' of https://github.com/SalesforceFoundation/Cumulus into feature/940-genericize-addr-settings-ui
Adding new method defined in interface to implementing classes.