US #29 Widget resources
US #29 Allowed custom widgets
us #21 - integer as json
Fix #1. Problem with fields inside hierarchy
US #8 Fixed pagination when too many entries
Fixed DateWidget test
US #1 Documentation for configuration
Fixed bug #3 problem when obtaining config for extending object
Fixed problem when obtaining class
US/13 sort column style
US/13 add list sort support
US/13, get sortable properties
US/13 show sort links in the table
US/13 integrate sort in the table
US/13 sort list api