Rakefile: Add :spec task and make it default.
Rakefile: Add :spec task and make it default.

iharthrush/leaflet-draw-rails,igor-drozdov/leaflet-draw-rails,iharthrush/leaflet-draw-rails,iharthrush/leaflet-draw-rails,igor-drozdov/leaflet-draw-rails,igor-drozdov/leaflet-draw-rails