Hardcode the city as string attribute of the directive
Start the work to retrieve weather data with a directive controller
Retrieve weather data, and make the city attribute work with its controller
The city directive's controller works without  passed to it
Display the weather as raw JSON, and remove useless data manip
Add d3.js for the coming chart
Fix API URL and data parsing
Since data is fetched async, we need to watch it (it's undefined at the beginning)
Do not display json data
Display a chart using d3.js