Silverstripe 4 support

Merge pull request #15 from madmatt/pulls/fix-ss4-nomodifier

FIX: Fields with no modifier set fail to re-populate after a save

Field name fixes

Merge pull request #10 from jkRoberts/features/set-value-compatibility

[FIX] Date Selector field names being returned incorrect for this set…

Initial release

Merge pull request #9 from helpfulrobot/add-standard-scrutinizer-config

Added standard Scrutinizer config