Don't update data on each datepicker keystroke

[nicoespeon]

When you type a date, data gets refresh between 2 keyboard strokes, which is not desired and make it lag.

2 possible solutions:

• debounce datepickers streams so it would wait enough between 2 keystrokes
• listen to another event than the update one (kind of a mouseout event)

[nicoespeon]

Note: test .debounce(500) instead of focusout > better UX