Improved validation
Added FormBaseCell
Remove unnecessary method isValidAsEmail
Bug fix numeric fields

The value of numeric fields must also be set to nil if nothing is entered.
Changed permissions
changed permissons to 644
changed permissons to 644 Examples dict
changed permissons
changed permissons
changed permissons
changed permissons
Merge pull request #68 from papo2608/master

Validation improved