BUG Fixed incorrect static member declaration
- Changed configurable static variables to private as per recent API updates to 3.1
- Use of statics as configurable variables replaced with config api usage
Merge branch '3.1-config-compatibility-fixes' of git://github.com/tractorcow/silverstripe-userforms into tractorcow-3.1-config-compatibility-fixes
Updating composer.json to require 3.1