Merge pull request #674 from SalesforceFoundation/feature/264-settings-validator

Health Check tests and ui improvements
Merge pull request #675 from SalesforceFoundation/feature/264-settings-validator

Updated missing links on NPSP Settings and NPSP Resource pages
Showing the user a simple message if the address verification settings are valid, instead of the raw JSON string.
Merge pull request #677 from SalesforceFoundation/feature/630-addrverif-test-message

Showing the user a simple message if the address verification settings a...
Trying to retrieve the label with prefix, if if failed without it.
Merge pull request #680 from SalesforceFoundation/feature/678-healthcheck-prod-error

Trying to retrieve the label with prefix, if if failed without it.
Merge dev into feature/264-settings-validator