Updated `Netzke::Basepack::DataAdapters::ActiveRecordAdapter#apply_column_filters` to support both hashes and JSON-encoded strings of `column_filter` parameters. This is necessary if someone build grids w/ pre-configured filters
Fixed `Netzke::Basepack::DataAdapters::ActiveRecordAdapter#apply_column_filters` to cope with my recent re-factorings of `#get_records` (2)
Updated `Netzke::Basepack::DataAdapters::ActiveRecordAdapter#apply_column_filters` to support filtering _on_ a specific date