Fixes #3337: made sure 'flash without redirect' warning is only logged when flash is _not_ empty.
Allow enchanced ebean models to be configured in build
Ensure class validator errors are reported

Fixes #1955
Merge pull request #3338 from DennisVis/fix-for-#3337

Resolve #3337: Always generates log warning for flashing with non-redirect status in Dev mode
Merge pull request #3347 from pvlugter/ebean-subprojects

Allow enchanced ebean models to be configured in build
Merge pull request #1955 from jroper/1955-form-class-validator

Class Validators errors are not reported in form.errors()