When changing the datetime (correctly) and pressing enter the map will display that specific timeframe
whenjs for loading radar data and animation is no longer restarted when radar data is fetched
move of code block to (hopefully) prevent merge conflict
getting radar data and animating seperated so now there is a fluid change of direction of existing lines when the data changes
Merge branch 'master' into interpolate

Conflicts:
	viz/index.html
	viz/js/birds.js