Added constraints to system
Related fields are now auto-configured by new Annotations OneToMany, ManyToMany and ManyToOne
Started mongo constraints
Testing new constraints features
Removed concept of RelatedField. Now is automatic.
Added new form field types EntitySelectField and EntityMultiSelectField
Added some tests
Automatic field rendered for Entity and List<Entity> type properties
Some bugfixing in constraints
Added constraints in mongo archetype
Bug fixing on constraints
Some bugfixing in constraints
Added constraints in mongo archetype
BugFixing