Web::Dash: render index page with descriptions of lenses.
Lens: _result_array_to_hash(): numerify 'flag' field as in POD.
Web::Dash: add /search.json endpoint.
Dash: add basic search capability to the page.
Dash: add SimpleSpinner.
Dash: set 'input' event handler to '#query' with EventRegulator.
Dash: execute search when changing lens.
Dash: treat no result as error.
Dash: introduce lens_manager. You can now select a lens with arrow up and down.