Objects matching the expression 'collection'

• #623 documentation for export/collection and virtual resources (collection, export, resource, virtual)
• #808 Virtual definitions in outer blocks do not get realized by collections in inner blocks (collection, definitions, iteration)
• #809 Definitions that only produce collections are not considered to have done any work (collection, definitions, iteration)
• #1003 Collection Selector expressions broken (collection, collector, collexpr, rails, sql)