added Allow Sorting config option to List Pickers
removed AllowSorting config option from TypeaheadListPicker
Merge remote-tracking branch 'steroberts89/master'
added Json DataSource from @steroberts89
fix for bidirectional relation query
commented out RelationMapping feature from all EnumDataSource Pickers
simplified Relation Scope dropdown config to a Relation Identifier checkbox
Json DataSource defaults to a url
simplified RelationMapping configuration (now uses comment field for additional data)
Merge branch 'master' of https://github.com/uComponents/nuComponents

Conflicts:
	source/nuComponents.DataTypes/Shared/JsonDataSource/JsonDataSource.cs